Fewer delays during play. However you can apply cold spray yourself during breaks…seems like up to five times during a three game match.
https://corporate.bwfbadminton.com/news-single/2024/11/15/updates-to-events-regulations
“Elimination of cold spray allowance during a match – The allowance of one cold spray per player per match, provided by the Tournament Doctor, is eliminated. Furthermore, the Tournament Doctor will not be providing cold spray to players during intervals.
Players can still apply cold spray to themselves (or by a team medical staff member) but only during intervals.”