All I can say is that; 1) all my fluorescent fixtures are pre 1970, so all use magnetic ballast, and they do not work properly when the shop is below 40F. and 2) the lifetime of a typical fluorescent tube in my shop is less than a year, so I'm always changing a tube, and 3) here in So. Oregon it costs $1 per foot of tube to properly dispose of fluorescent tubes at the recycling center.
Those 3 factors alone make the conversion to LEDs worthwhile in my case. I did not replace fixtures, I simply rewired them and removed the ballast.
I'll burn that bridge when I come to it