Canon's DPAF is still the best for Vlogging- as soon if they update their next round of DSLRs and new MILCs with serious 4K video specs and proper codecs, they'll have the potential to again have the cache with video makers that Sony and Panasonic currently enjoy with their lineup. But we already knew that
Most Vloggers don't need 4K, but more advanced low-budget filmmakers / social media / content creators / influencers want the best specced cameras and that word of mouth spreads down to the Vlogging masses and guides opinion, creating buzz and excitement.
You're first point is why I personally was disappointed with the 6dmk2 and moved on to another - it had the potential to be a great camera, rather than just a decently performing one. A few upgrades in features, or a lower starting price would have meant a far better reception, I think.
Back to the video in question though, wouldn't the ff camera and a 24mm 1.4 lens weight more than one would like for vlogging?
I would have thought the M50 with the 11-22 would be a better option : you lose the bokeh yes, but gain better video, lower weight, small size etc?