This is awful. There's almost 9x as many Korok Seeds as their are shrines, so they should definitely weigh more than shrines.
I'm saying that Korok seeds are much less important and time intensive than shrines and dungeons so their value should be weighted less. It's like how if you have 10 quizzes and 2 tests, and the 2 tests count for much more of your grade than the 10 quizzes. I was just throwing numbers out there, but the point is that if I was creating a system to track game completion, you'd have to find several Korok seeds to equal the amount of value of a single shrine. Plus I think the Zelda world is rightfully biased towards dungeons (and shrines are minidungeons). If someone asked me how far I was in Ocarina of Time, I'd say what dungeon I was in and not even think to mention how many gold skulltulas I had found. Likewise in BOTW, I think of progress in terms of divine beasts and shrines much more so than I would think of progress in terms of Korok Seeds.
I'm not saying the in-game counter is wrong or even illogical because it makes sense based on what they wanted to measure. I'm saying that what they are measuring is far from how most people would describe their progress in the game. The percentage is more of a map completion measurement as Satan said. It's just a matter of perspective though. It doesn't matter if you think of Korok Seeds as 72% of the game or as low as 1% of the game; if you want to complete 100% of the game, you have to get everything anyway.
Sorry slightly off here but anyone else notice that discovering a shrine but not activating it leaves it as an orange mark, activating it turns it blue with an orange center and completely blue means complete?
I noticed that earlier in the game when I stumbled on major tests of strength before knowing what I was doing. I thought it was a nice touch to track what you've done. I would get killed and then when I'd eventually feel ready to complete the shrine, I could find it pretty quickly again. I think the shrine itself changes color along with the map marker in a similar pattern as you just described. First it's all orange, then the top turns blue once you activate it, and finally the whole shrine is blue once you complete it. My next playthrough I might just activate the test of strength shrines to open the teleport function and come back later.
Also i feel like finding all chests in the shrines should count towards the map completion for the fact that it literally shows you on the map if you've found it all.
I'm 90% sure that "open" means have opened and have taken the contents of the chest. I have some blessing shrines without the treasure chest icon which would lead me to believe that trying to open the chest doesn't count towards earning the little icon. Only taking the contents of the chest counts. Unless blessing shrines have more than a single chest in which case I've overlooked a lot of treasure. I like your point though. Finding and opening all the chests in shrines is probably the most challenging part of the game. There are a number of shrines that let you reach the monk but still have one last challenge for a chest that's more difficult than the prior puzzles.