Just as much fun as a blind playthrough?
Personally, I'm playing Nioh 2 right now and the game is one of the hardest I've ever played. I'm using a video guide as I play to find Kodama hidden in the levels so I can farm health flasks and EXP more easily with a buff they give. The game is exactly the same, the experience is the same, it's still brutally difficult and I need to still "gid gud" but I thought see the level ahead of time would take the fun out of it but it fact it makes it more fun and I don't have to spend the time wandering around levels looking for these things nor have a fomo that I'm not picking them up. I'm usually against guides unless it's after a playthrough for the platinum but I have to say I'm having just as much fun, if not more playing this way with a slight glimpse into the upcoming level.
I wouldn't play any souls game this way cause of the level design but for Nioh 2 it works. I'm all for it and may adopt this style of play in future to cut down on time lost or frustrating aspects of a game. All the is different is time is being saved. It's not like it's fun looking for collectibles, hidden secrets or the like.