I recently created a datapck and noticed that all items and blocks start with "toms_storage:ts.". Toms Storage is the namespace, but what is the "ts." for?

I know that this means that many recipes and models, especially those from other people, will no longer work.

No, that's not how that works. The ˙ts. is a prefix on the item/block id. It doesn't affect it.
The 1.21 version removed these because I rewrote most of the mod.
Your files have to start with ts. in the datapack. (ts.crafting_terminal.json)

I was just a bit confused, especially since all the other mods didn't have it. It doesn't break anything in that sense. That's why I just thought that the ids had ts by mistake, but if it's intentional...