It is true that advice for in-game teams is reducible to "grind more", but there is almost always something you can do to make the game easier without grinding. Some examples:
* teach this TM to your Pokemon because it is good against three gyms.
* replace x Pokemon with y Pokemon because it evolves faster and has a higher growth rate.
* give your Pokemon a Sitrus Berry so you might not use a turn to heal.
In any case, if people were happy with "grind more" as an answer, then there wouldn't be such a demand for in-game team rates. It is very obvious that people want other advice, and PokeBase can service that.
There is also the distinction between "please rate my team that I am currently using" and "please rate my team that I'm planning to use" -- telling somebody posting the latter to "make sure you grind enough" is hilariously unhelpful.
I'll repeat what I said in the thread KRLW linked: if these posts are allowed, then we will enforce very high standards for quality/detail on them. This wouldn't be some "here's six Pokemon and tell me what you think" sort of deal. It would be a genuine effort to optimise the team for the game in question, making it simple to beat. I agree that the advice would be likely to become repetitive -- but if we find that becomes such a large issue that the threads aren't valuable anymore, then we can just stop allowing them (and maybe write some catch-all threads on the main section). We haven't tried at all and I think we should.