a few points on this thread
1. blm is more mobile now but it's still very immobile. you can pool up to 9 gcds of instants such as in pantokrator but this is an extreme edge case
2. aetherial manipulation is not a good movement tool, it requires you to burn an instant to not clip it, meaning it's only worth doing if the distance covered is larger thab what you could move with 1 instant's worth of movement, and usually as a black mage 1 instant is sufficient for most mechanic movements you must do
3. summoner can do the same amount of dps of an average to above average black mage for one tenth the effort. It is very hard to justify having a black mage in content that really matters such as ultimates, not so much savage since that's midcore