To the extent that you do have a point (and the further back one goes historically the greater that point is - Beethoven being about the point of dubiousness IMO), I simply don't have the room (or the budget) for the squillion different instruments involved. I note the latest Roland (?) digitals have a suite of historical pianos, but I doubt they will satisfy your requirements.I also note that the earlier back one goes, the more commonly composers freely re-instrumented their compositions, meaning they were more bound to the music than to the sound of the instrument. It was also many of the composers themselves who were the restless pioneers of the many "advances" you now bemoan.
What I AM saying (I'll re-state for clarity's sake) is that these instruments are not without purpose or beauty - that they DO have some wonderful points and can be fantastic to listen to and to play if one has the chance. I have done so and found it to be a wonderfully enlightening and magical experience.
A natural horn is wonderful fun to play, and some of the early music (Renaissance) for horns really is exciting stuff either to play or listen to
Anyone know how inexpensive it is wise to go on one of these to find out if it's something that seriously interests me vs me just being me again ? I.E. would a $200 Indian flute be a piece of junk ? I mean you can buy them for $20 or $2000 !
Wooden flutes do have a lovely and haunting sound. I have a 19th century one which I fiddle with now and then... I wouldn't be sure on the price vs. quality, but if my recorders are any guide I would think that the less expensive ones would probably be quite satisfactory -- at least my tenor recorder is. The main thing is the intonation of the instrument, which is largely where the holes are bored -- so if they get that right, it should be OK. But as I say, haven't tried them so...