There have actually been 104 out of 124 (84%) heroes picked in the Bali Major so far. If you only count those picked 10 times or more it's still 54/124 (44%).
Sure, it's not even close to a fully even representation, but still, it's not terrible. The last larger League of Legends tournament had 79 out of 163 (48%) picked at all, with 42/163 (28%) picked 4 times or more (less games in the tourney).
Yeah that doesn't sound that bad. Maybe I just didn't watch enough to see more heroes picked
Yeah I mean the main ones were in every game, but there's always one or three or so non-meta ones sprinkled in. The human mind sees and focuses on patterns quite easily, while it's harder to see the ones not fitting it :)
There heroes that are really safe to pick but if you compare with league of legends, dota actually have a big pool on competitive scene. I just think that 7.33 is a bad patch and there is too much overturned heroes and too much bad ones.
It's what is referred to as "the meta." As heroes get buffed, nerfed, changed, etc. the meta evolves. If Hero X and Hero Y are really good at doing something and Y gets a buff, maybe Y starts to get preferred. Now you know what was really bad vs X? Hero Z. Now hero Z's weaknesses aren't so obvious because Hero X just isn't strong enough to stand against all these heroes that are now being picked.
Eventually a couple months goes by and players have figured out the end of that X>Y>Z chain and a meta is born.
Now usually there are a few large tournaments each patch. During these tournaments we already know the strong heroes, but what about hero/team combinations? What about some cheese/pocket strat that a captain has cooked up? Sometimes certain players or teams just elevate a hero to broken status. It just works better than anywhere else. Well now the opponents have to decide "do i ban Y and Z and leave A in? Other team makes A just way too good, so ill leave Y and Z in play. Oh that worked really well, now how do I counter what else is being picked.
Eventually a new patch (more buffs, nerfs, changes) is released and everyone starts from 0 again. Sometimes (rarely) heroes get so overhauled they remove them from competitive play in order to get them somewhat balanced.
It's kind of late so I didn't do a great job explaining
Well it sounds like a good thing, to keep the game fresh, and to jazz things up a little. The only thing I don't like is when I watch tournaments I always see the same few heroes, and no variety of all :(