Missed out on a 100% Raikou yesterday due to a disconnect after the raid timer had expired.
I would like to see a 5-10 minute grace period where it would still be possible to rejoin a raid attempt despite the timer having expired. The current timer should only be a cut off for joining the lobby, which it is, but once you've joined you shouldn't be screwed over because of something that is out of your control, in this case a network error and a disconnect. Also, a lot of people in the raid got the error at the same time, indicating it was related to the game and not just my phone/connection.
I know that it is advisable not to join raids with less than 10 minutes left on the timer. But with a disconnect occurring maybe once every twenty or so raids and the odds of getting a boss you actually care about catching (i.e. 85% or higher, let alone a 100% one), making an outcome such as this highly unlikely, all of us in the group decided to go for it anyway, many of us not even having a choice due to the new 45 minute timers.