I’ve had Pirelli STR’s on my T7, they are a tubeless tyre run with tubes, which are OEM fitment. I did the Outex conversion and had zero issues for the 20 months I had the bike (I put it back to standard tubes when I sold it as although I’m perfectly happy with the safety, the next owner would have to make their own decision).
Concerning the safety bead on tubeless rims, in the ideal world you would want that, but it makes no odds to safety unless you either run low pressures, ding the rim off road, or get a puncture and either don’t notice or ignore the what you feel while riding. Most bikes with tubed tyres these days have the safety bead in the rear rim, but the narrower front rims don’t. A tubed tyre will deflate much quicker than a tubeless wheel due to leaking air through the nipples and the puncture whereas the tubeless will only leak air from the puncture. I fitted TPMS to monitored the tyre pressures and I didn't air the tyres down that much going off road.
I think there will always be pro’s and con’s to doing the Outex conversion, but being able to plug a puncture rather than spending an hour or so trying to fix a tube on the sides of a road in the rain, far out weigh the negatives.