Heard this argument more often than I can count: you can't summon primals/avatars that look like them since its against the lore; destroys the planet/lifeforce etc... But how come we are able to Summon THE primals through a FC? Wouldn't that make us just as bad?
No, you're not alone, but I personally do not agree with you. And there are plenty of Summoners that are more than fine with how it is.
I personally and deeply despised FFXI's incarnation of Red Mage or rather how it was utalized by the public at large. What I was told was promptly to deal with it, even though it deviated heavily from the concept of the class as it was conceived earlier on.
This situation is no different. I'm sorry your immersion and attachment to the class is broken, but I feel the reasons why they kept it the way it is, is fitting.
Summoners, the ones in the previous games, were rare, exceedingly so. In ARR they are quite possibly very common now. There had to be a clear distinction between the Godly Primals that prove to be force to be reckoned with to entire armies, and the creatures that were easily beckoned out by 'Summoners' who are as common as any adventurer.
As far as your last question - we don't know. But you can be sure it will be explained and justified in the lore when the feature comes out. Maybe such a thing is controversial, maybe it becomes a last resort weapon against something.
Back to the art of Summoner and its changes, I find myself enjoying Arcanist/Summoner much more because of them. Summoner in FFXI for the majority of its ongoing history became regulated to being a pseudo-white mage, even with their Summons looking completely like their Prime counterparts.
This change of scope for Summoner is refreshing, and makes it so the summoner themselves are not weaklings in combat. I find myself much more engaged with this version than it's previous FFXI incarnation.