i'm not talking about specific details but more so how this would change matchups.
example: if we had a better grab game, then chars like Ike, Shulk, etc. who love to approach with their autocancel aerials would fear getting shieldgrabbed and rely on different approaches.
Shulk's ironically one of the worst examples you could've picked because Shulk doesn't have aerials that autocancel on short hop lol. Infact, he's one of the only characters in the game who can't autocancel any of his aerials on short hop (the other 2 being Megaman and Greninja, though Megaman is odd because his NAir works kinda strange in terms of how it suffers lag). Shulk's NAir/FAir/BAir have to be spaced otherwise it's piss easy to just shield grab him on landing because he
always suffers landing lag. The only aerial he has that can autocancel at all at a reasonable time is full hop FAir and even then you can't be in Speed or Shield (due to reduced jump height). The reason why this misconception exists is because Shulk's NAir has relatively low landing lag (12 frames).
Although a better, faster grab would certainly be nice with a little more range would be nice. I don't even think his throws need all that much in the way of changing barring maybe a lower angle on FThrow. Would make his ground mix-ups more threatening. Aerials could also save to be a little better. A slight damage boost and significantly lower landing lag would be nice, again to compliment his onstage game. They should still have bad range and knockback though so Mac retains his susceptibility to being combo'd in the air.
I don't think the character needs more range considering his speed and frame data, and projectiles don't suit him at all both in terms of character and gameplay.