I just want them to insert the Caster backstory and the Kuzuki backstory from Hollow/Ataraxia into the second half of the show. I mean, we already got a short glimpse of it when she caught Shirou in her web, they already gave the Black Panther + track team bonus screen time, and they surely have enough runtime for it. Unless they're planning on adapting Hollow/Ataraxia after Heaven's Feel, there's no reason not to.

On the earlier unlimited route wars subject, HF>UBW>>Fate, and everything ufotable>everything DEEN. The anime original Caster arc by itself is enough to soil the entire adaption. I don't think that ufotable is doing the best job possible and UBW could honestly use more trimming than padding, but they're still miles ahead of DEEN's attempts. That said, Carnival Phantasm will always be the best Type-Moon adaption for all time. Funny Type-moon is just infinitely better than serious Type-moon.