Most of the #bettercartoon people miss the point and make "family friendly" or kid cartoon concepts while the Ren & Stimpy and Hazbin Hotel will be adult cartoons. You can't disregard the target audience or you will end up with no audience. Comedy Central, where they'll air the Ren & Stimpy remake doesn't care about your, mature or kid show ideas, not so surprisingly they want comedies.
And while there are some fine concepts in the hashtag, nothing is really fleshed out, just concept arts, no pilots and no audience. These shows (as much as people may not like it) already have an audience and a big one at that, and the companies would rather go with something that already has a big following than something that might be better but has no following. Numbers matter big time in this industry (oh and also connections).
This is a perfect example for what I said earlier, there is no fleshed out concept here, just a vague description, no characters, no target audience and not to mention how expensive the animation would be if they used these character designs.
Imagine how hard and complicated this would it be to produce. Since most of the main characters are deaf, they'd probably talk using sign language, imagine animating sign language perfectly in a cartoon, not impossible but expensive, this is a minus point. Most of the people don't know sing language, so you'd probably have to use subtitles and most people in the USA don't like to read the subtitles, that's an other minus point. The target audience of this seems to be deaf people, there are around 466 million deaf people on the world, out of all that, there is around 250,000-500,000 deaf people in the USA alone and then you have to think about the age demographic you'd have to promote this to, let's say we have a young adult- adult demographic so based on
this old data, you'd have the audience of around 100 thousand (or less) people watching this which are very bad numbers by the USA standards. Overall this wouldn't be a good investment, it would be expensive to produce with a rather small audience, better off as a comic book or something else instead.