Agreed with everything here. A lot of the issues pertaining to the show is just unavoidable. Some things have to be condensed, as it's too late to do anything else. Especially with Littlefinger. I would also argue that Petyr was traded in for Cersei. I do think Baelish should have lasted longer than Cersei, but i also believe they both should be deader than dead before the war, Cersei mostly.
How and why? Serious question.