My reason for not allowing capitals is that it changes the whole balance in hisec, and would push the game even more towards the big blocs and old very rich players, OK this inability to gank with enough players is of course a reason, but I would not get hung up on that apart from using it as an example on how stupidly over powered they would be.
Rorquals in hisec is a step too far too.
The question I had at one point was whether carriers and dreads and even fax’s would add to the game in hisec, and I think it ruins the game too.
It is a moot point because CCP would never do this. I hope…