I go in blind if I'm there for it at release. If I'm not, then I don't. Had a load of fun in the first two stages of Gordias, and then later on, Deltascape this way.

As far as figuring things out goes, it's usually not that hard to figure out as an individual. Coming up with a cohesive plan for all members of the party is another thing, though, and that's why people make guides. It's a playerbase driven initiative to try and get people on the same page more quickly(not to mention a way to show off how good you are at the game).

These days though, I skipped an entire Savage tier, and I didn't feel like I missed much (thought part of me was dying for the gear upgrades). My raid leader since then in the one group I returned to, as I don't see myself having enough time for 3 statics, does the Savage tier week 1 with his Ultimate buddies. He still raids in three groups, and this kinda has made him just put out the same strategy for every group. It's usually pretty close to what Mizzteq guides do, but sometimes waymarks are a bit different or relative directions are flipped. I didn't watch any guides for E9s or E10s, but I did watch a couple for E11 and E12.

That all said, there's more guide makers than ever before, I think. I think the game's difficulty has changed in such a way that more and more players are picking up fights faster and faster. There's kind of a limit to what they can do mechanically, and that's why people always say stuff like, "Oh, these are just Shiva circles." or "This is just an older fight with new paint." For instance, in E12s we got the Twice Come Ruin debuff, which shows up directly in Delubunum Reginae normal. The mechanics of that debuff are identical to the chicken debuff from Rabanastre. Get hit = gain stack, gain enough stack = trigger effect of stacks. But even the concept for it first shows up in Second Coil Turn 9 with Frost and Flame debuffs from the dragons. Get the same debuff twice = die.

For some people, especially longer running raiders, this sort of leads to a feeling of, "I've seen it all, and just need to re-contextualize it for the fight it's showing up in that's current." So you could say after playing the game long enough, having done enough endgame content, no savage raiders truly go in blind. And that speaks nothing of the PC players that go in with 3rd party tools that let them see things they aren't supposed to be able to see, giving them additional tells.