Boiko
I mean, the boost grab thing is reliable on only a couple of characters. Dthrow to tipper upsmash is pretty helpful sometimes but will never come into play against players who know the matchup. A lot of the cast has grabs that are literally always free followups with some other DI mixup. From my last set with you, I think that you wouldnt have an issue recgonizing that ike's uthrow is probably one of if not the best throws in the game, but can still net kills of fthrow and bthrow mixup. It wasn't the issue of interaction that warranted the change, the change was to nerf sheik. What's interactive about ike that sheik didn't have before? Both could carry tech chases and combos fairly easily especially off grabs mixups. Even ness has pretty guaranteed stuff off of his dthrow, and a bthrow kill option, although I acknowledge that he doesn't really fall into the same category. I'd argue that a mixup that forced players to guess where they were being thrown based on tendencies and positioning was more interactive than dthrow-->dthrow-->dthrow-->dthrow-->dthrow.
Sheik lost her guaranteed (or 50/50) kill setup off a grab, which is unprecedented for anyone who has ever played the charater and is pretty much is the change everyone's pissed about. Sheik still obviously has one of the best throw games, and I actually prefer her melee bthrow against everyone (except roy, but it seems that speculating that character is heresy). The issue is that the mixup has been around for years and people have spent time learning it over 3+ iterations of pm. Personally, I actually liked pm over melee for the sole reason of sheik being more fun and less braindead than melee, because let's face it, melee dthrow is boring. Changing sheik's throw game was inconsistent with the patch (no one except maybe bowser got a change as significant) in the sense that it made her more like melee, which is upsetting to project m sheik players. There were other things they could have done, like change her uthrow so uthrow/dthrow would be a mixup without as potent tech chases, or maybe just make her grabs a little bit slower or change the scaling on them they wouldn't be as good at high percents or cause knockdown at low percents.
I can't deny that her matchup spread was maybe a little over the top, but there were multiple ways that she couldve been changed while still being fun.
Sheik is still good but I'll be playing ike and maybe even mk way more than her. She's more boring than even melee sheik, which is really saying something.