I'll be honest mate, your entire 'Cuckmann this!!' 'Cuckmann that!!' Schick is getting a little wearing to read, and your lurid fantasies that somehow he's internally deeply unhappy about having his Game Story turned into a high-profile HBO TV series of all things are fanciful at best. I think the lifetime residuals he will earn from it will more than allay any concerns he might have over the 'sanctity of his vision', even if he never manages to produce anything worthwhile afterward (which seems increasingly unlikely to be the case).
Different mediums require different treatments, this isn't some grand revelation. Also, the practicality of production has to be factored in when dealing with real actors, as opposed to game ones, especially if you're looking to deal with time jumps, etc. For instance, a lot of the usual YouTube Critics made a big song and dance, over Natalie Portman not beefing up and working out for the last Thor Film for instance. As terrible as that movie was (and it was dire), there were practical reasons why they went the CGI Muscles route, because, on top of playing female Thor, she also needed to play 'dying of cancer' Jane Foster. Sometimes people's need to simply 'hate on' something gets in the way of understanding the 'why' of things. Does knowing that make Thor: Rock and Thunder a better movie? Not at all, but at least we can criticize it fairly versus make ourselves look like clue chumps in the process.
Let's assume that the events of TLOU2 run over two seasons. Now it makes sense to probably go for a bold open on Season 2 where Joel gets his head stoved in by Abby in the first episode, devoid of context, to act as a narrative hook for the audience. Then they spend the rest of the season covering events from where the first season left off up to Joel's grisly end in full detail, parallelling the stories of both Joel and Ellie as well as that of Abby and the fireflies and how they ended up joining the WLF and finding Joel. This way they can keep Pedro in the show for the second season, maybe even Season 3 with flashbacks.
Now the thing to consider with the character of Abby in the game is, that she undergoes several body transformations. Firstly she's young when her father gets killed she is pretty normal looking, when she's in the WLF she's roided up, then she's leaner when she's with Lev when they get caught by the Rattlers and finally, she is emaciated when Ellie confronts her on the beach. Is it practical to ask an actress to go through all of that for over two seasons of television? Especially on a shooting schedule. The weight gain and bulking up would be a challenge, but the weight loss afterward would be brutal, and studios aren't keen on actors going to extremes. Matt Damon famously wanted to starve himself when he did The Martian, just so he could look emaciated and the Studio said 'No way Jose' because he almost died pulling a similar stunt when he did Courage under Fire in his twenties. I expect Kaitlyn Dever might Gynm Rsat it a bit when required, but it makes far more sense for the writers to change the character up and adopt a different approach, esp given there was a massive backlash against Abby's appearance within the gaming community as unrealistic given the post-apoc setting, and that sure as hell wouldn't be any the lesser if they repeated the exercise there.
Don't get me wrong. I think Druckmann is an absolute hack, and it still astounds me to this day that TLOU2 came to market as it is because the entire storyline feels like a rough first draft versus something that should ever have seen the light of day given just how many gaping plotholes run throughout it. However, nothing can't be rectified by the TV series at the end of the day because HBO expects their series to pass muster. Unlike AMC who were happy with the rating success of TWD, never mind the actual quality, HBO wants the ratings and the critical plaudits come awards season. Awards are a big thing for them, it keeps them on top and it keeps them being able to license their shows overseas.