Edit: I have been made aware that this is already the case, so this post can be disregarded.
Since Shadowlands raids have become easier to solo, i have been working on unlocking the skips to last boss, for easier mount farming, and it got me thinking, wouldn’t it be nice to have those skips accountwide through the warband system, as it takes a conciderable ammount of time to unlock them on alts. Since Transmogs unlock across all classes now, you have pretty much collected almost everything by the time you unlock the skip on yor first character, so its not like there is much to benefit by running the full raids for weeks on alts.