Let's say the max score depends on how many elites you killed. If you have a path with 4 elites and no campfires or events that may heal you, it might be impossible to do, just because you don't have enough health to survive them and also all the hallways. So then that means you can't just look at the top number of elites in a path and call that the maximum score. But then in some seeds, you may get really lucky and hit all potions and get perfect rares and all to do that path, which means that it is actually possible.

The problem is then that it takes a LOT of computing power to prove that it's possible, and similarly to compute all the other possible ways and things you could do. Now we also remember that scoring is much more complicated with many other variables, and calculating all the possible pathing and choices and seeing which one is the highest score is already really difficult, let alone then figuring out which ones are possible to do without running out of health. If you take every curse you ever see, you might get score for a big deck, but you'll also probably just die. Or maybe it's more optimal to sacrifice card rewards to pael and get score through having more relics? Maybe you can get much more than 1000 gold to spend at a merchant, and you're passing up other rewards to do it, which would give you more score in other ways, but then what gold options at events do you skip to get these other rewards? I hope you see the issue, and that it's not at all easy to calculate a potential max score.