Hi,
for this:
https://www.openstreetmap.org/way/862549100/history
I don't removed these tags, I reviewed my edit and I may be done by mistake, I apologize for that.

for this: 
https://www.openstreetmap.org/node/10870872904/history , and https://www.openstreetmap.org/node/10870870891/history

Yes, I removed correctly, because its duplicated addresses.

For Generator: Yes, I deleted because it duplicated sign also, You can check it out.

For comments: Yes, You are right, I'm negligent in commenting sometimes  !

regards
  