I'm not about to scour through thousands of lodestone profiles for you. The figures came from FFXIVCollect, which is a website people use to either lookup others or lookup themselves to see what they have collected. Usually, this is because they are collectors. Collectors usually have achievements visible, but not always.
The fact that, consistently, more people have the Savage mounts than the Extreme mounts should say something. The amount of people with the Extreme mounts only seems to get higher once the Extreme trials are "easy" to unsync quickly ie. HW and SB.of that group how many now have the achievement for clearing M1 savage?
Not quite. Just because you can unsync it doesn't mean all of the mechanics are irrelevant yet. Often unsyncing doesn't become common until it's old enough to where the mechanics don't matter. Parties struggle to fill for old content if they have to bother with mechanics.As for P, we just cant use that data, both savage and extreme, you can now do it unsynced. So its irrelevant.
Obviously unsyncing will have happened to a degree, but ultimately, the statistic on the % that have the savage mount is the same. Even more have the Valigarmanda mount than the one they can unsync for. Which really suggests that a lot of people just see Extremes as a joke as I said.
They could grab some of these old Extreme mounts but they don't even bother, yet they do grab the Savage ones.
The first set of data was from FFXIVCollect. The second set of data was from Lucky Bancho, a JP player who scans the lodestone to figure out the number of active characters and other stats like this. I can't help you with the data because what they do is very complicated, but you can take a look at their latest datahow did you get at that data?
https://luckybancho.ldblog.jp/archives/58771096.html
The most solid data there is the actual clear rates being either around 50% or 33% depending on the world. This is out of people who have the M4 Normal minion. Which should be almost anyone that has done M4 once a week for a few weeks. It's a statistical way of saying the content probably isn't as hard as some people are perceiving it.