ummmm.... what? I agree usage does not prove if something is broken or not, but it is a very strong indicator. also, things can be different on two types. Why is zapdos legal on electric? The ban was flying only because flying needed a nerf. If nobody uses altaria on flying and flying needs a nerf, banning altaria will not make any difference at all.I feel like I have to keep saying this every 10 posts....
Usage or lack thereof does not prove whether a pokemon is broken or not.
I don't care that Altaria isn't common on Flying and neither should anyone else. If it's broken on Dragon teams, it's broken on Flying teams. No ifs, ands, or buts. An Altaria on a Flying team will do just as much damage to Dark or Fighting than an Altaria on a Dragon team will. I'm still not entirely convinced that Altaria is broken, but unless you can think of something besides usage that differentiates Flying Altaria from Dragon Altaria, they are both equally at risk of being banned.
On the topic of Pinsirite, I was honestly quite shocked when the idea was first brought up, but I do remember all throughout XY and even into the beginning of ORAS, I considered Mega Pinsir to be one of the most threatening megas out there. It's definitely no joke. I'm not entirely sure it should be banned, but it is certainly more of a pressing concern than Manaphy (which is outclassed by Keldeo imo).
And for those of you that are concerned about Bug's future if both Genesect and Pinsirite are banned, I guess I just have to be blunt with you. Deal with it. For now it's only a possibility, but even if those two bans happen, Bug will still be viable. It will likely drop in usage but it will still be far from the likes of Grass and Ice. Other types have lost key pokemon and survived (Dark users are probably still salty about Greninja). Bug can survive too.
I hope the pinsir thing is a joke, it is good but not fast enough in todays metagame. I think the only op thing about bug is the move sticky web (no tailwind does not count.)
Hoopa-U needs an instaban on psychic and a test on dark, and Hoopa regular will be balanced on both. Landorus-I is not overpowered at all. Mega Sableye is great, but not broken. Each type can deal with him, be it with setup or with a powerful special hit. Charizard-X needs a ban on flying though, it has better typing than altaria (in my opinion) and is more threatening, has higher speed, has sd to break stall, has willowisp, wow.
Altaria I'm not decided on. I have finally started playing monotype on the ladder and will resume when the OMOTM gets changed, so I'll see after some testing. Zapdos i don't know either, and i obviously cant find out since it is banned.