BLM unneeded skills

[Renius]

So as I get a better understanding of this job I find that there are some skills that you hardly ever use. Before I put them on my aux bar for those skills that may be needed seldom if ever I want to check with more experienced BLMs. Of course I am referring to higher level play.
To me these are of no real use: Blizzard, Thunder, Sleep, Aetherial Manipulation.

So, is it safe to assume that if I just set these aside there will be no major loss of any kind? Are there others?

Also, how do I use Blizzard II effectively? or does it belong to the above list?