Funny, i never had any problem with my tubeless setup for a whole year until my back tyre decided to randomly deflate on the first day of my holiday. Tracked the problem to leak around the valve. Put a tube in for the remainder of the week. On return, stripped wheel, replaced all the tape, refitted valve, added sealant, reinflated, sealed etc. Tyre flat the next morning. Still leaking at the valve. Tried a new valve but still the same. Looked on CRC for different design of valve that might fit better. Find loads of complaints for all sorts about leakage around the valve.
Today, it’s the same discussion on here. Until 2 weeks ago I’d never even considered it.