1. Trying to prevent fod ingestion
2. engine instability due possible reingestion of burnt exhaust gases(reverser looks to be both core and fan reverse)
that’s my best guess. Id assume driver couldn’t give a rodents bum about either if he is running out of pavement.
not sure why they did it on the 220 as it’s a fan reverser. Maybe it will get binned when they figure how to install ROW/ROPS.