Was this post before games started being played? As I personally think that made it much easier to follow when it was actually happening and not in theory.
Were you using FIFA rankings here as an additional way of explaining it? Because its by UEFA ranking which is much less shit than FIFA.
Level A playoffs will still be the group winners. Its just in all likelihood they'll be playing to just win the league, not for a qualifying spot.
Its 1. An additional tournament and only then 2. An addition to qualifying.
The Nations League finals are next summer while qualifying ends next November - they can't possibly base the finals on qualifying results.
Anyway, aside from the slightly convoluted impact on qualifying (and I still don't know the impact on World Cup spots as opposed to the Euros which I'm less fussed about shittier teams making at this point), I do like it at is makes the qualifying less of a drag being March-November and gets rid of some friendlies. And adds a fun little summer tournament.