I'm looking for run and gun travelogue stuff + stills and the R6 running 4K60 at 29 mins max would be fine for me assuming recording time is accurate. Also need to see what actually causes rolling shutter, the examples I've seen on the R5 that have caused RS look unrealistic to me, I'd never whip pan like that.
Having IPB at that frame isn't great but I can probably live with that. We'll see what the A7S3 looks like, but I can't see the AF, IBIS, form factor and general usability being as good as the R6/5 if history is anything to go by. The Sony menus have (historically) been painful and the A7's don't feel great in the hands, to me anyway.
The focus on frame rates and pixel counts etc seem all consuming but I think useability is underrated. The bang for buck on the Sony's is great, market leading, but in terms of overall package R6 looks good *on paper*. We'll see.