The earliest reels I used had dismal drags, I learned to backwind. However, it wasn't too long before I got to buy reels with far superior drags. At that point, I learned to mix and match. Nearly forty years on, I tend to fish with centrepins an awful lot, but the fixed spool reels I own invariably have superb drags. Whilst it's perfectly effective to use these fixed spool reels with the anti-reverse permanently engaged, I still tend to mix and match as I see fit. I have had one reel that featured no anti-reverse switch. It's not something that I would choose in the future, but using it was no great challenge. The fact that the drag was excellent helped immensely.
However, the one thing I sometimes do, that rarely gets mentioned, is set a drag a bit lower than the maximum appropriate for the line being used. I then control the spool rotation with my finger tips. It's quite similar to the way a centrepin user might play a fish.