I think they could've managed to bundle it but Zaslav's team obviously still has no clue about how to manage or design streaming services. I'll give HBO Max credit for the best 1080p video streams as I honestly find it comparable to BD. I also really like how they will offer the option to watch director's cuts for some of my favorite movies in the extra tab as most services don't offer that at all or require an extra search if they have it. Just rewatched Star Trek VI Director's Cut last night on our cheap 4K 75" Hisense.
Disney managed to bundle National Geographic stuff just by giving it its own tab in the top ribbon, the same for Marvel and then Star Wars. I think the works well. HBO could do something similar and does somewhat have it in a clunkier way. Instead of a ribbon at the top, you have to either scroll through everything or go to the sidebar (which also has its quirks). Paramount+ is also similar to this, but worse. I can't say that I like either of these approaches but I really like the top ribbon design.
The bottom line is that HBO Max, Max, Warner Bros. Discovery, or whatever they want to call them, are a mess. I don't believe they need to reinvent the wheel or go back to the drawing board but do need to realize that viewership isn't always about content and pricing but also accessibility. If the platform is a mess people will still be less inclined to want to use it. I do doubt that Zaslav will care though, as long as HBO has at least one hit show per quarter to depend on to fund it. Discovery, however, is likely to experience a slow death until they come back to trying to merge it again, and probably still in some sort of half--- fashion.
