But we of course have to remember that there is really no end to how far you go in improving your reading and should always challenge ourselves a little each day.
100% absolutely. I don't view mindleslly sight-reading relatively simple pieces as fruitful
in se, no matter how much good music is there. such as items by Schubert or Haydn, to give two somewhat obvious examples of extraordinary composers who can, nevertheless, very often be read at tempo. With some mistakes, perhaps!
That is, it's rewarding in some ways for discovering new pieces or absorbing new ideas, but for me it's just a convenient way to find ways of progressing, even though new techniques might not be forthcoming on a regular basis.
Although they can. New techniques or ways of fingering various passages can be found rather quickly in this way.
But, no one really likes to do chores without purpose. And, I'd venture as far as nobody who is good at reading music from fresh really needs practice at that task. Like riding a bicycle or something.
Except that reading Messiaen or Schönberg or so many others....they have considerably different bicycles to learn to ride. I find your optimism that increasing gnomic, even obscure or eye-blurring works can be handled adeptly very encouraging.
To borrow a phrase from session musicians or jazz people, indeed, it's a height of accomplishment to be able to read fly sh*t off a page two seconds before the red light goes on! Something to strive for.
I suspect any artist in any medium craves novelty and challenge, and reading music is no exception. Yet, one never knows what one will find in some odd places in the printed repertoire.
Good sight readers cannot give up polishing up difficult pieces to performance standard.
Right. Sight-reading is just a tool, but if it's one's only tool, such as a hammer, then everything looks like a nail.
As in probably all arts, discrimination and application of the correct tool is half of the battle.
Memorizers to me perfer not to improve their reading skills too far, so long they can find the correct notes, fingering and coordination they will then go ahead and attempt to put it to memory in all sorts of different ways.
Yeah. It can be discouraging, on the one hand, for the sight-reader to wonder at various mechanical tricks of The Memorizer.
On the other hand, it's a temptation to dismiss the abilities of The Memorizers as just some kind of trained monkeys, without analytic ability or breadth of stylistic diversity or command, by a sight-reader's, I assume, generally unconscious comparative weighting of various pieces or even techniques or patterns at a smaller scale.
I still follow through with the notion that one needs both abilities. I don't know if it's yin and yang, or quiet penance vs. self-flaggelation, or whatever, but I can imagine, particularly a younger player, investing these contrasting "styles of learning" with some kind of affective, competitive content.
For all know that's perfectly fine: I don't teach younger people at all (let's say, younger than 18 or so, you know...I don't socialize with high school students, and I don't advertise, so, that limits my pool of contacts!), and never anything "classical" except some basic practical pointers derive from scalar work or use of intervals as it comes up in improvised music (or just copying parts from various pop music albums....I don't have any method, just show some of my peers some tricks, back when it was more possible to do such things prior to The Plague. Without exception, always it's somebody who wants to learn a specific solo, or help with songwriting/harmony, or the basics of a certain style, which is easy for me to demonstrate and give tips on). I probably shouldn't call myself a real teacher at all, except in the literal sense that I trade stuff for other stuff, or used to, before the whole thing with the novel virus and all that (!), just some guy who occasionally exchanges money (or beer!) for tips to people among people I know or friends of friends, and so forth.
But, yes, I have to work very hard at memorizing pieces: I don't think it's due to reliance on the page (after all, if you've read the piece
n number of times, it probably shouldn't be called sight-reading, really, just relying on visual cues or aides-mémoires. I just don't the memory I did at age fifteen or so, say twenty-five or so years ago. More probably, life is just more complicated as one gets older: it's not
all brain damage, probably. Although, some of that too.

So, there are tricks for that too: sketch out Roman Numeral Analysis on post-it notes, or that kind of thing. Or just listen and replay from memory a given piece, inside one's inner ear. First with great concentration, and eventually an automatic recall of the sound and structure. Sometimes it even works!
But that's getting a bit off-topic, I suppose.