The white bit between the black keys

[tunneller]

Do you ever have occasions you need to play white notes by sliding fingers in between the black keys?

I am trying to beef up my scales, and am at D Major. Consider the LH fingered as per recomendations from this board, doing thumb-over, and for good measure think of starting them at C# with 3rd finger. Then 4th finger on F#, then 3rd finger on C#, etc. The rest of them white notes, with the hand gliding nicely up the piano from left to right. All makes sense until I get to a recomendation to lead the motion of the hand with the wrist. That rotates my hand so that the fingers 2,1 or 3,2,1 and really perfectly positioned to play in between the black notes.

Is that a skill I should try to learn? At the moment when I do it my fingers typically catch on a black key on the way while playing the white. Or should I aim maybe just a centimetre or so below the black key and leave it at that.

Thanks, John