? And here's why... e4 is now lost due to the pawn on d3 being pinned (16.d4 instead was probably playable)

Now that Black is a pawn up, simplifying is a good option

White offers a Queen trade, further simplification

Looking to double rooks up on either the f-file or d-file, depending on which one is opened

That'll be the f-file

Stopping Rf2

If 27.h3-h4 here (looking to open up the g-file) Black can just play 28...gxh4, as 29.Rg7+ Kh8 30.Rxc7 h3 31.Rg1-g7 threatening mate does not work due to Black having multiple checks using both rooks on the f-file, and then the h-pawn can march home

Making the most of a cleared back rank, threatening to swing over to the a-file

This move effectively forces the rooks off, and Black will have a clear won endgame

The point being that Black has a pawn majority on both flanks (a/b/c files and f/g/h files) so will be easier to create a passed pawn