You're the next in a long line of PokeBase mods who've tried to make something out of RMT. I wish you luck.
Here's the insight of the most recent person to try and fail, which you're welcome to take with a grain of salt.
RMT in its current form is never going to be a serious alternative to Smogon forums
Since we're invoking Smogon, why don't we compare what we've got to what they've got?
Here's their OU forum, other SV forum, and past gen forum. Certain RMT doomers might be surprised to find that Smogon is not exactly a utopia of high-quality teams filled with knowledgeable people giving elaborate top-down reviews of their fellow competitors' begetting. Plenty of "Replies: 0" and "this sucks, pls read ___ first" to be enjoyed there.
Sure, the organisation is better, the discussion is more lively, and high level players are more likely to post there. But still, I don't really care to use it any more than I care to use RMT. (And in RMT's defence, the red "0"s you see on every post disguise the fact that a majority of posts do receive comments.)
All of this is to say: the issue we're grappling with is just as much "there aren't many good Pokemon players and most of them don't care about rating teams from the 1400s" as it is "RMT kinda sucks".
I think we need to give it more of an identifiable niche. To this point, I (cautiously) suggest allowing more open-ended "build my team posts".
With the above in mind, you can probably see why I don't think this is going change anything.
Even if there was a demographic of people waiting for us to finally wave the magic wand that makes it all better, I doubt that demographic will want to read even more posts from people who obviously haven't used their team before, by definition this time.
But we can try if people want.
allowing well-thought-out in-game teams
Been there and done that! I used to be strongly in favour of giving this a go. Nowadays I have my reservations.
I just don't see a reality where we'll have a consistent stream of people making teams who genuinely care about being efficient (the only metric we can advise on), instead of just using Pokemon they like in their playthrough. Disentangling the "I like Chimecho, don't replace Chimecho" people from the rest is hard enough with competitive teams.
A lot of honest in-game team advice, such as "cull half this team because you don't actually need it", is likely to piss people off. I consider these problems unfixable. I rather we focus on having this flavour of content exist on PokeBase in some form. I may get around to this one day.