I was in a similar situation as you for a while. My perspective changed when I realised that it's a great thing to make going on walks -- another habit that I've wanted to get into (for physical+mental health) but never really did -- a little more interesting and fulfilling. Now I'm at ~2000 quests completed.
I have been using it for a while, and I have filled out useful things like bus stop shelter and seating, road surfaces, opening hours on shops etc.
Near me right now, I have a few house numbers (adjacent to known house numbers), one probably unnamed pedestrian passage to name, and loads of default speed limits.
When asked to put in opening hours, if the sign in the window says 0800 daily, you don't write "well, I was there at 0830 last Wednesday and they weren't open yet, so maybe 0900?". Similarly, you don't write "I parked there for two hours yesterday and I didn't get a ticket"
If there are official-looking signs (not a scrap of plywood with NO PArkiNG written on it with a marker), I don't think it's the cartographer's job to investigate whether the clamping company is legitimately authorised to demand a release fee, how thoroughly the operator enforces restrictions, or how long the warden takes on their rounds.
I've seen a lot of quests on StreetComplete that seemed a lot less relevant, like the number of stories a house has, or the style of roofs. I guess that's useful for 3d maps, but personally I don't see much value in that relative to mapping addresses and street rules.
As best as I can tell, there are simply no boots on the ground on the east side of Indianapolis. Unfortunately I’m not in a position to do much about it myself, but the sheer volume of missing data is a pretty strong deterrent.
I'm just saying that as a newcomer, being able to fill out things with obvious personal usefulness like "does this bus stop have a shelter and seating" is really cool and engaging. As is having a diverse range of things to fill out.
When your area is already pretty thoroughly covered, it's not as fun to say "this stretch of road has the same speed limit as every other stretch of road nearby". However, once you are an engaged user, doing a few of those things every so often is fine.
What I was trying to say in my original comment was "if you can't find anything interesting to do in it try somewhere else (when you can)"
I guess there is still a bit of a barrier to entry, but once you get used to it it's a fun way to explore your neighbourhood and find things out.