"The OM-3 shoots very high quality 4K/60 10 bit with full sensor width and minimal rolling shutter. I call that advanced. "
No open gate. Poor quality bit rate and encoding. No real time LUT/film sim encoded with the video- you have to grade it out of camera, increasing workflow, etc.
No, I don't call that advanced.
Just having a stacked sensor by itself doesn't mean the rest of features become advanced.
"And it has dedicated mic and headphone ports. For a photo centric camera, that's close to perfect video specs. "
So do several other cameras around.
"As for compact, it's the same size as my 1983 OM-3. That's compact enough for me."
Compact is the EM5 Mark 2. Compact is the Penf. Compact is the GM5. Compact is the G100.
This is smaller than the OM-1 and may be compact enough for you but it's not really a compact camera.
"This is an enthusiast camera. $300 more or less is hardly a deal breaker for this class of gear."
That's hardly the issue. The issue is that this camera is not coming in a vacuum and there's plenty of enthusiast competitive cameras around.
The question is, will this camera bring more customers outside of the already "converted m43rds" owners.
This is not what people in MFT that wanted a compact modern camera were asking in m43rds land either. We were asking for a GM5 successor, a PenF successor, a GX9 class successor, an OM-5 successor, and EM5 Mark 2 successor.
This doesn't mean this is a bad camera per se but this is not exactly what people were asking for in m43rds land.
"Will MFT go extinct? Maybe. People have talked about that since before the format was launched, since the Olympus E-1. "
Except 4/3rds did die, didn't it? And contrary to the YouTuber Tony's, there's an argument to be made about the fact that the marketshare of m43rds has continued to shrink and shrink. I expect the OM-3 to sell great the first two months like most cameras do at first due to pent-up demand or influencer advertorials, but would it sustain at the 6-8 month bracket?
It's possible, but the unique selling proposition of m43rds to really stand out by being small I dont' think it's exactly made with the OM-3.
I am not talking about the perspective or just your needs- you buy whatever yo want, carpe diem, we only live once. Hey, I totally get that

. I am wondering about the health of the mount and if this model, while better than nothing because it shows OM Systems seems to have a "pulse", I think we still need that small modern compact. I am looking forward to see what the OM-5 Mark II will be- hopefully more than "just USBC."
- Ricardo