I do want to point out that this is an absurdly weirdly western ero dev thing. A lot of Asian developers, even if they make slop, at least finish that slop. There are a TON of eastern indie ero games, and their indie culture in general (VNs, manga/manhwa, light novels and similar) is pretty established with better paths to 'professional' success than the west right now. A long of the stuff on dlsite that goes on to sell like bonkers are from 1-3 man teams too, which a lot of people don't realize for some reason. And these games release with far less time and funding than games like Summertime Saga had.
And it's a disturbingly common pattern... look at Subverse for example. Eastern developers aren't perfect of course... MGQ Paradox, lol. But he still has more complete games under his belt at least than 99% of the western games on this site (and I don't count Paradox part 1/2 as a complete game lol).
Not all western devs, not all asian devs, but yeah, still. I don't know what the cultural difference is that even slow Asian devs steadily actually finish their stuff or at least make consistent progress while western devs go "wow everyone likes this cool thing I made WHELP kthxbye" and turns into stardust before shimmering away in the wind.
It's mindboggling to me. Yes it takes work but this dude could finish Summertime Saga and let it sit milking with nothing but positivity and zero guilt just like Monster Girl Quest and similar popular games and make oodles even if chose to never make anything else.