...I kinda cant believe that someone whos trying to troll fails that badly while doing so... that said I assume hes being serious why I'm trying to explain...

1) Why is anyone cross classing a summoner skill because hes summoning a mount? Its not as if that word would be limited to that one and only meaning of being a summoner skill...
2) Fenrir isnt a summon in FFXIV at all - he might have been in IX, he might have been in XI (havent played it), but he isnt a primal in XIV - but a boss in snowcloak whos now turned into a freaking awesome mount aswell. Just because you were used to him being a summon it doesnt mean that he always had to be... have a look at Valefor in CT...
3) If I recall correct you wont be able to use flying mounts in our current areas - Fenrir will be as legit as every other ground mount
4) Have you seen how freaking awesome Fenrir looks?! The whole point of it is vanity - you dont need that mount, but you probadly want it - at least I wanted a Fenrir-mount after I first saw him in snowcloak
5) ...you might be right about the grind-thing...

To answer your final questition: This isnt FFXI. Get over it. This is a new game - new game, new rules, thats how FF always worked! If you want to play XI, well, play XI... Fenrir in XIV is as far from being a summon as the sheeps that you have to slay outside of Limsa...