What has all this got to do with my post?
well...
1. discussion was about let qualies being played outdoor these days, when some events apparently get canceled, apparently authorities suggest that people don't go out without a need, and exhibition match was suspended due to smoke
2. actual competitors collapsing or complaining apparently due to air condition
and you say that Rafa, with other main draw players start training, hence we will see if they complain or not.
as others noted, one can walk away from the practice court. walking away from a qualies match has significant penalty: it's not possible to earn prize money, it's not possible to earn points and ATP / ITF might follow it up with further penalties for lack of sportsmanship
so, the roughly 100 participants at men qualies and 100 participants at women qualies, shouldn't be at the mercy of Novak, Rafa and Roger hitting the training courts and perhaps complaining or perhaps not complaining about conditions.
and additional players that will start playing the main draw event, when the weather conditions might stay same.
if conditions are fine, then why authorities called people to stay at home and avoid going outside without a need? (if true of course)
if conditions are fine, then why other events get canceled, like the horse event mentioned somewhere here above? (if true of course)
hope this answers your question.