Why do the Egis appearance look awful and unimpressive

[Nalien]

Or heck, the players got special "powah" against primals, they could have easily made a way for summoners to summon a de-powered Primal.

Like I said earlier, it's the fans fault. FFXIV was hated so much that they literally had to do everything to make ARR a Final Fantasy game in their eyes. That included putting Summoner in for launch.

If Summoner was actually summoning a depowered Primal, then that would have had to rush the story forward so much, the whole "Primals are evil that taint the very land they walk on" plot that has been going for all this time would basically have to be rushed to explain why Summoner can summon them anyway. Taking a portion of the Aether you were exposed to fighting the Primal, and melding that into your own pet Egi allows them to explain Summoner and not rush the plot, while still giving fans Summoner at launch. Currently the whole plot is building up to our Free Companies actually being able to summon Primals fully. Would I have liked that at launch? Hell yes I would, but it would have made the plot even more convoluted than it already is, there would simply have been far too much stuff going on and have made very little sense. What hasn't even been explained yet would have to be in the game by Lv30... Even if you just put it there, most of the Lv31+ plot would just fall apart at that point.

The only issue is how the Egis look, but I've hated how some summons looked in past Final Fantasy games already. I mean, Ixion instead of Ramuh? What the hell FFX. Clearly not a real Lightning Summon, the developers should have fixed that for the HD rerelease.