It's all very subjective as there are people out there who use full frame (or larger) systems and regard m43 as a tiny sensor, but the IQ from my m43 cameras significantly exceeds what I could get with 35mm film SLRs back in the day and the cameras and lenses are a little bit smaller but with far more features.
There reaches a point where the quality is 'good enough' for anything I'm likely to need and for me that has been achieved and anything better going forward is a bonus.and with equipment for all hobbies debates will go on and on.
I totally agree, as with any equipment in any hobby etc you'll get conflicting views, or the 'gear snobs' Im really pleased I switched to Olympus M43, does everything I need and more. My photos are used for friends and family, if I I was selling stuff then I'd just buy prime lenses. Though I do like the look of the new Pen, but not so keen on the price tag