Im a big old fanboy but its getting harder and harder to defend the writing at this point.
The plots fine honestly, in that the story they are trying to tell fits, but its the "how and why" things are happening that are crippling the show, which used to be the best part of GOT.
lets take 1 plot point from the last episode; the dragonstone ambush and see how this fits.
*ok because we somehow have half the unsulluied and dothraki surviving last episode we need to kill another dragon to equalise the forces further and show the threat posed by the scorpions, meanwhile build momentum and tension for the coming battle by losing mesundei and furthering the mad queen dany arc* ok cool fine.
There are a million problems with how they went about doing this, No scouting/didnt know a massive fleet was within firing distance; The absurdity of how accurate and damaging the scorpion shots were that killed reagal, firing a scorpion from a moving/rocking platform from behind line of sight on an upward arc towards flying objects there is to many problems here that require you suspend your disbelief beyond a reasonable amount etc etc the entire fleet getting destroyed but euron didnt just finish the job, how did they kidnapp misandei, know who she is, and get away Scott free the list is almost endless to how stupid this entire scene is.
You could achieve the same plot line for what you want to do, without it being nonsensical. start with a minor scene with varys maybe talking about how his little birds have gone silent or something blocking his supply of intel that would make it understandable he wouldnt have any knowledge of eurons fleet movements. Have it be really stormy with low visibility, for eurons fleet to move unnoticed or better yet, have them infiltrate the island beforehand and set up the scorpions at dragonstone in preparation for danys return and have them absolutely annihilate danys fleet from a prepared position on land, Or maybe they go back to the iron islands to meet up with yara first, but it was a ploy, and euron sent the ravens to lure dany in. litterally anything would have been better than "lol theres an entire fleet hidden behind a rock, but they can also fire scorpion hellfire rockets with an aimbot script from behind said rock at 100% accuracy.
Give a throwaway reason as to why all the forces split up AGAIN. ie why didnt they all travel along the kingsroad. its like watching a horror movie and the main characters go one direction and all the red shirts split up and inevitable are going to be killed.
Its eye rolling how badly the set piece moments are constructed in order to fit the storyboard they set out.