As with everything in life, it's probably good to know where you are.
For sports, what are the extremes and what is your target range?
Let's take tennis, which I know best:
highest <=> lowest people play?
slowest <=> fastest?
flat <=> max top-, back-spin?
deepest <=> shortest balls?
easiest <=> most difficult shots, in what situation?
Serve percentages?
Number of shots per rally?
Errors / total shots?
Heaviest <=> lightest racquet?
Softest <=> tightest string?
...
For teaching, especially beginners, I like them to try and experience the full spectrum of grips. From super open to super closed. In the extreme(s), that's probably hitting fore- and backhands without changing. (That's if you're still hitting backhands :P)
As a result, experience how that generally feels like, and what happens up the chain, the stance, and to the ball.
For most, to help find a middle ground that works for them.
Some may 1) stick with extreme grips. And/or 2) use them strategically later. And/or 3) consciously switch to accelerate learning and practice flexibility.
Personally I've done all 3. In my pursuit of becoming a (more) complete athlete, I've especially went after #3 - i.e. trying to cover the whole spectrum with the weak side to accelerate learning towards a "full spectrum athlete".
I'm still far away from that. But in any case, it's good to know - roughly - where you are :)