As a guitar player I would equate it to saying I will practice my fundamentals on my acoustic to ensure I am playing as cleanly as possible as opposed to through my electric on a channel with gain where my shortfalls are made up for by the gain on the amp.As much as I appreciate the sentiment, is this really a worthwhile endeavor? I equate it to a craftsman saying "I will intentionally use less-optimal tools to work on honing my technique".
For the sake of the discussion, another example: as a guitar player, that's like me saying "I'll practice on a guitar that hasn't been setup to work on my technique". A guitar that isn't properly set up is tougher to play, but it's still doable with some adapting. Does this really equate to getting better at the skill?