I suppose this isn't on-topic but I feel compelled to respond.
Squirtle is already super ****ing tiny, he doesn't need a good tech roll. Even then, he's fairly floaty so he shouldn't be forced to tech super often like a character like Fox or Falco might. The distance a tech roll goes isn't the only thing that determines how easy it is to hit a character out of it. A big part of why DK is so easy to tech chase is not because his tech roll doesn't go very far, but it's because he's ****ing huge and fat and even when he moves himself away, his fatass hurtbox is still relatively close to you. Here's an extremely professional and detailed visual aid of this phenomenon *snop*
I'm not asking for Sheik-level BS tech rolls here. The fact that characters have tech rolls of different lengths can be used as a large-scale balance lever; if auto-techchase throws such as GnW and Charizard ever prove to be universally strong, for instance, buffing some or even most characters' techrolls to combat it could be a great solution. Not every character needs a gigantic techroll, not even the ones I play!
I just think it is
gimmicky jank "poorly designed" (I know that's kind of a buzz-phrase but I can't think of anything better) that in nearly every tech situation Squirtle is in, techrolling is either dramatically weak or just outright wrong. In some cases teching at all is a bad choice! (Looking at you, Flame Choke.) Since when does that make any sense? That would be like if l-canceling doubled your end lag instead of halving it. Why punish someone for doing an important advanced technique?
Additionally, Squirtle's techroll is the same as it was in Brawl. That isn't an inherently bad thing, but it does sort of suggest that it simply never occurred to the PMDT to change it.
Now granted, Squirtle's techroll isn't the only weakness in the character, and he has ways to counteract it (not getting grabbed or spiked or whatever situation puts him in a techchase in a given matchup, or just taking advantage of his low friction to slide offstage and put himself in a different but less broken bind).
You are right in saying that Squirtle doesn't need a good techroll to be balanced. He needs
a techroll at all to be well-designed, however.