What do you mean by "sort by function"? Like a list of guitar types?
The stack thing is definitely interesting and it's something just put in my notes. Would you like to see stack belonging to famous artists? Or by music genre for instance?
By function I was thinking more of a filter to show only "reverb" pedals, or only "delay" pedals, so you can compare specific pedals that do only specific functions.
I think stacks belonging to famous artists would be super cool, but probably very niche (and hard to source/verify?). More helpful would be a 'generic stack for xyz music genre' - which I guess would be subjective, but would be a good resource for someone like me who wants to get a good tone, but has no idea where to begin pedal wise for say Math Rock.