If it is flat straight grip or a very small straight grip I just can not adjust well enough to shoot it consistently. And shooting consistently is what it is all about.
That is the same for me. I have big hands & even the Prince of Wales grip on one of my guns is really too skinny for my hand.
The hand needs to be not closing up too tightly on a small grip or be over extended trying to get a grip on something too fat.
There is a natural grip size for hand size in there somewhere.
A comfortable & naturally manageable handfull.
O.M