I'm, generally, not bullish: But only because the predominating "what value do products like this bring" arguments from those who are bullish is some variation of "it's great for learning/beginners". That's simply no way to build a venture business (and replit has received... $105M).

Higher layers of abstraction can make sense; no code tools can be killer; but that isn't really replit. Replit is just a weird product on the side of the abstraction spectrum which requires its devs to understand a large chunk of what would be required to get, say, a nodejs server running on, say, Heroku.