I'm going to assume op is talking specifically about the shadows and shaders and that in this hypothetical scenario, the bot update and putting the game on steam still happened.
After taking several years to reflect on it, I think removing maps was a bad move. The new shadows make the game look wonderful.... outside. Meanwhile building interiors look colorless and bland unless you build a forgetton of windows and make sure they're facing the right way. I always turn them off on any server where the majority of the action happens indoors cause it just looks so dark and bad. I was ok with this at the time because I was under the impression that wrench lights were going to be updated as well to make up for it, but that never happened.
Maybe maps weren't so great as people make them out to be, but they were an extremely popular feature. Most people were cool with them being removed after the update was announced, but I can tell you absolutely no one was calling for their removal prior to the announcement. Now that I know for certain that removing maps totally didn't pave the way for all the cool updates we were promised, I'm comfortable saying it wasn't worth it. Shadows and shaders were basically an attempt by badspot and kornman to make the game sell more copies on steam. I think it was successful in that regard, but it seems like most of the remaining active users these days have been playing since before v21, and most of the people who bought the game immediately after the update only played for a day or two then moved on.
With all that said, do I think that if maps had never been removed, the game would magically be way more active and prosperous than it is today? No. I really doubt all those steam boomers who clearly didn't fall in love with blockland would have stuck around this long just to explore the maps.
All in all, I think if v21 had never happened, the community in 2020 would basically be exactly the same. Only with more horrible post-modern meme maps. And frankly I'm sad we'll never get to see those.
You could argue that maybe if maps were never removed, there would be less of generally hateful attitude towards badspot in the hearts of certain fun characters who have pulled off certain fun and cool pranks in blocklands history and in the last couple months especially. But I doubt it would be significantly different since some of the literally pyschopaths in this game have hated badspot since long before v21.