Reasons are actually stated, they explained it is not feasible for the general case.
Once the devs have made clear they don’t plan to do exceptions (as other softwares do) then users should accept it and move on instead of keep harassing volunteers.
... except VLC implements time-based seeking which has pretty much the same requirements and is consequently not possible with literally all files either. But both are possible with 99.99% of video files you will come accross.
VLC developers are of course free to reject any feature request but if they do it by bullshitting their users (and that includes tacking on additional requirements that no user actually needs like perfect support for all formats under the sun) then they will be rightfully called out for it. Then throwing a tantrum and citing CoC violations is not going to improve things.
It's their project so ultimately they get to choose to run it into the ground but this kind of behavior is not something I want to support as a user os I will stay away from VLC which includes not making helpful bug reports and not donating.
Once the devs have made clear they don’t plan to do exceptions (as other softwares do) then users should accept it and move on instead of keep harassing volunteers.