This is how I see this issue...let's use an example. Let's take a theoretical. Brand new player to FFXIV, uses a jump potion to pick a SAM and get it to 70 on their first day in Eorzea (remember, this is theoretical...roll with it). They don't have any foundations on DPS'ing or rotation, but they jump into Susano EX - and all they do is spam random buttons.

You're not going to pass sword phase unless your healers are on point with their own DPS. You wipe because this SAM doesn't know how to do his job, doesn't have any foundations to do anything even remotely good with the class.

That's my issue with the option to completely skip normal. Perhaps it does spoil...but at the same time, you have some foundation on what to expect. And if I recall, the first tier of endgame raids are usually the easiest. And easy? Psh...I have run into more parties that can't even get out of the cave phase with O3S than I have seen clear/farm parties. We don't need to encourage more casuals who don't have their foundations down to skip ahead. It's already bad enough that the wall is quite literally O3S for a lot of groups, or even Shinryu Ex.