I found all the shrines too.
Exploration for exploration's sake isn't as fun when you already who know you're going to "explore" before you start. 99% of the time it was another shrine with a very very similar gameplay loop. Even the dungeons felt like big shrines in terms of their sameness. The gameloop was fun to start but it gets very very repetitive. I'd rather a linear game with less exploration if the idea of exploration is an empty wilderness with a tower and shrines that all play so similar you realize how similar they are after the third or fourth one.
The towers and map feature killed that very sense of map exploration and turned exploring into looking for destinations that you could check off a list. A list they give you. Removing towers actually probably would've improved the exploration game mechanic way more in my opinion.
But for you to downplay the Witcher 3 which is heralded for its open world design and being full of life and to prop up BOTW which received criticism for its open world design and there has been a lot said about its emptyness is a bit surprising. If anything, you could critique the combat of Witcher 3 and its depth but seeing how BOTW's combat also suffers from the sameness feel after the first few hours of the gameplay loop, I can understand not wanting to bring it up. Especially since nothing in Witcher 3 compares to the weapons degradation mechanic in BOTW. Stunning to consider that game anywhere near the top 10 all-time with such a massive flaw in a core game design.
I cannot think of a single instance in my time with BOTW that compares to finding random quests and/or encounters in the woods or wilderness of Witcher 3. Zero. Never mind the writing and character development in the Witcher 3 compared to BOTW (especially the ending, don't get me started on the end of BOTW). If the content a game can point to for being open world is a laundry list of towers/shrines to discover that turn out to be almost the exact same as the previous one and will be almost the exact same as the next one and you want to herald that as content then be my guest.
Roach > Epona
Edit: Not to get in an argument, to each their own. But to downplay Witcher 3 is a bit laughable in my opinion. Cheers, game on, you do your thing.