I thought this as well. 3v3 and 5v5 are different games and I don’t think semc realized how different. To simplify, in 3v3 it’s much more of a lvl and item race, and all about positioning in the jungle. Lane is kind of the last goal for your team and more of something you maintain rather than try to win, at least early game.
In 5v5, lanes are the objective early game, dragon camps in river are the secondary objective late game, and jungle is somewhere you go to get an advantage over a certain lane or to pick off enemy junglers for a lead in gold/a buff in power.
They are two completely different playstyles as I find 3v3 is a cat and mouse game of who can stay safest while getting the biggest lead in gold and items in order to push the lane and force enemies out of jungle to defend it (and way more about getting them kills!), while 5v5 is more strategic in terms of when you are positioned where on the map and how much support you can afford to put in a specific lane in order to push it, and relies way more on team map awareness than 3v3 does, not to mention jungle is way more of a pit stop between lanes than somewhere you’re supposed to stay (and is way more about objective control).
Basically, it comes down to 3v3 being much less of a thinking mans game and more of a straight up battle of skill and will, while 5v5 is much more about deciding where to be and how to play there (and where NOT to be) than it is about your actual skill and will. You can be terrible in 5v5 but if you coordinate your team it doesn’t matter as much, while in 3v3 you really have to have individual skill to make the dream work, as your lack of skill is much more impactful both solo and in teamfights.
Just some critical observations from someone who can’t help critically observing .