@Chaotic45 I wear an FFP3 for work. It's not comfortable. It has filters that needs changing monthly. If it doesn't have changeable filters then it has a limited lifespan - no more than a few hours - after which it needs discarding. It can't be flung in the washing machine like my cloth masks
Both FFP3 and FFP2s need fit testing by law, which imposes a hurdle.
There is research (although frustratingly I can't find it - saw it back in the spring when we were looking into this at work) which predates covid showing an unfitted FFP2/3 is no more effective at protecting the wearer than a surgical mask. In essence contaminated air gets sucked in by the path of least resistance - round the leaky sides. They feel like they should be more effective, but the evidence available then was that they weren't.
I haven't seen any research on how well unfitted FFP2/3s protect others, for the simple reason that until Covid the only reason really you wore one was to protect yourself from industrial hazards. I would guess maybe? But whether it's enough to outweigh the disadvantages of decreased comfort and cost?