Re. whole-page versus section editing. Personally I prefer it when people make multiple small, focussed edits. But I do agree with Suedo that there are some cases where whole-page editing is needed.
One of my beefs with Visual Editor on desktop is that it dumps you into whole-page mode even when you select the section-edit button. The edit summary keeps the section name, creating misleading history. If you cycle back to source mode then you are still in whole-page with a mass of wikitext to wade through.
I’ve seen cases where editors make a big set of unrelated changes – some good, some quite bad – across multiple sections. Then the next person has to decide whether to revert and throw out the baby with the bathwater, or devote a lot of time to picking through the changes line-by-line.
So, yes, please make whole-page editing available, but don’t make it the default experience for newbies and don’t break section-editing!
The savvy bad-faith editors who use multi-locus editing to hide their insertion of political, nationalist, or racist PoV amongst good changes will still work out how do do so, but let’s not make it easy for the clueless to mess up articles.