It’s a whole office suite.

And even if you use it only for bug ticketing there are products that are big enough that it takes a long time to implement changes. You really don’t want outsiders to be able to read open bug tickets for security vulnerabilities you are working on fixing for example. And you also don’t want outsiders to read your planned features either, probably.

I think it makes perfect sense to use e2e encryption for bug tickets considering this.