I agree there are too many frames, and they need to spend more time bringing old, outdated frames up to speed rather than making new ones which end up feeling like a variation on a theme. But unfortunately I don’t think they have any intention of stopping, as that’s kind of their monetization model. A “free to grind, pay to skip” game doesn’t make money if there aren’t new things to grind/pay for.
I do absolutely think they need to slow warframe production to only 2 a year because having a 5 year gap between original frame release and prime release is just ridiculous, which is where they are heading if they don’t slow it down a bit. I mean think about it, even if they eventually reach a point where they say, “ok, that’s it. we’ve made our last Warframe,” it will still be another 4 or 5 years before the prime of that frame is released. That’s bonkers to me. Entire games come and go in that amount of time.