I’m pretty sure most people’s sentiments around environmental hazards is about the same as most people feel about builder-type heroes: cheap, unskilled, and unfun.
It would create zones that are harmful for heroes who depend on jumping in and out of team fights to get value.
Players might all together try to avoid areas that have traps because neither teams want to risk getting caught in them. Or you have an effect on the meta similar to Illios’s Well map where there’s a big bottom-less pit in the middle of the objective and people build comps around pulling and knocking their enemies into instead of trying to shoot each other.
I also would take a moment to observe the way the Smash bros. competitive community generally avoid stages with hazards and traps that would interrupt the pace of competitive play.
I think environmental hazards could be more fun in PvE co-op campaign game formats, though.