ISP yes, but where is that a sensitive info?
Location… rarely and it is almost never accurate. Yes I know I’m living in small country and in bigger countries where an ISP can be even town related, plus domestic roaming can be sometimes problematic, the situation can be slightly different, but I doubt anywhere you can be pinpointed accurate. Here in Finland, EU my location is always at least 100 km off.
That is true in Europe and IP didn’t show my location accurate in London (well… that is still part of Europe, sorry 
), New York or Los Angeles.
Other sensitive info? There is not any.
And still… an admin can find out your IP really easily even when it is not shown on side of Discourse.
From my point of view whole IP is just noise, and the biggest single reason why admins are struggling with error 429 — because so many are sharing same IP.