Do you really want an entire alliance wearing i45-49 stuff in ST? Honestly, I think this is a needed change.
ST has a requirement of IL 70 iirc, so that's not something they'd be able to do there (at least not with ALL their gear). The example was referring specifically to LotA and Pharos.

Regarding ST though, something that probably ought to be done all around the board is that gear swaps should be prevented if they would bring you below the dungeon's IL requirement... that or gear swaps in instances should be prevented outright.

I don't get why people don't just go spiritbond in the open world. It's easy and nobody has to carry you.
Because the open world doesn't drop you i100 gear, oils for i110 gear, or allagan tomes. It's not hard to figure out...

MMOs provide a lot to do. People wanna multitask.