Even stupider if you get on TV in my opinion. It gives off a picture of speedcubing as a joke. Granted, it's not the most serious sport but feet solving just makes it look ridiculous.
It's bad for the image. Speedcubing is already viewed as geeky enough. It's like, there's reciting pi and then there's reciting pi with your armpit.
Also: If you are organising a competition and want to have feet, at least don't put it late in the day (especially in summer...).
It gives a horrible impression to almost any noncuber. I've had a few friends who fully respect cubing, even a few of them can solve a cube, but whenever they hear about feetsolving they either think it's a joke, or it's the stupidest thing they have heard.
Anyway, apart from just feet which I hate, I dislike 6x6 and 7x7 for a few reasons, including;
-time constraints. They take so long. And if you say "don't host them" when hosted they are mean of 3 due to the time it takes to solve them, and I don't think mean of 3 is a good format for any event, when possible the format should ignore the best and worst result.
-it offers little over 5x5, and the fastest 6x6 and 7x7 solvers are generally the fastest 5x5 solvers.
-hardware, there is only one viable choice, this isn't the WCA's fault obviously.
The only thing I like about 6x6 and 7x7 is that there are people who average 12+ at 3x3 who are fast at 6x6/7x7, but 3x3 has a bigger effect on 5x5 meaning only fast 3x3 solvers can be world class at those events.
And then I hate Pyraminx due to tips. I wish when it was originally added to the WCA is was just a tetrahedron, without the tips. As well as making it a better event in my opinion, it would also allow advancements in hardware.
Don't get me wrong, I like Pyraminx obviously, but I would like it far more and actually have it as my favourite event if it didn't have tips.
Edit: As for corner turn octahedron, this is only similar to a Pyraminx if you use an L4E like method on Pyraminx. The top 50 solvers currently at Pyraminx don't really use a method that compares anything like the corner turn octahedron. I have 2, and average 20-40 iirc (I think the puzzle would be probably 15~ if official or faster). It's basically a Pyra->Megaminx like how 3x3->Megaminx, but isn't solved in any way similar to Pyra.