I also need to apologize here. Others e.g. Kovoschiz might already know it, but I tend to think/write/type directly, which I think has the tendency of scaring off people. Please don't be too scared 🥲.

Tbh I don't quite get the optimal usage of changeset comments. The thing is that the changeset author will be notified of new comments. I just take new comments as something I should respond. Maybe I got the entire feature wrong.

Regarding the sudden curve, I took a look at the ESRI imagery again, and again, you are right: the east side also is misaligned. Indeed, my intention was to "finish the changeset asap" and the curve is what I decided to do because I thought the east side was correct. But it was/is not. I have made a decision based on wrong info.

Thank you for pointing this out! I will write down a todo in the map so that me or others can improve this area in the future. I do spend less time on OSM nowadays compared to some time ago so some of my changesets perhaps is not the best.