I understand your concerns. What kinds of changes do you think should go through a process like this? Just hard forks?
I was thinking that an advantage of making all BIPs use this process is that it makes it familiar and well used. Kinda like a muscle grows stronger with use. If only hard forks go through the process then there's the risk that the process has to be spun up whenever they happen which might cause confusion.
Another reason I was thinking is that even small, local changes, it doesn't hurt to have a few more people take a look at it and approve it.
The bureaucracy only applies to BIPs, not PRs. There's only been 18 approved/final/accepted BIPs in 4 years since BIP-0001. That's only about ~5 per year. I get that bureaucracy is often a waste of time, but I just don't think every second counts for these things.