Prove it, show me a game, where a 6 man team played through HoE without cheesing, zerk walling, and using a pure meta setup which always includes a berserker and medic. Spoiler: You can't because you're all talk.
Not asking for much, a team of 6 with any combination of commandos and support beating HoE while running around the map or simply sitting out in the open is good enough for me.
Such salty. It's pretty easy to do, actually. As I said, we didn't cheese any maps but black forest, and we've done farmhouse to the boss without both berserker and medic. You don't need berserker and medic to get to the boss, i hope that you're no that stupid to not understand that.
You're right in one thing (only one thing): it is harder (not impossible) to kill hans (hans =/= whole HoE difficulty) without berserker and medic. That's bad, I agree.
First of all, it's pretty easy without just berserker. Everyone can take hammer and just parry/block him. We can easily do it with just support/medic parrying, berserker is not required at all.
Second, i bet that its possible to beat hans using only 6 berserkers. I don't have 5 friends playing KF2 and only one of my friends plays berserker (and he is only lvl 10), but I'm sure it's possible, simply because it's easy to change aggro. So, medic is not required either.
Third, the word "meta". Your problem is that you don't understand that you can only blame yourself for using bad team compositions, not the "meta".
May be you're stupid enough to blame the game for not being able to beat it using only knives, because it forces you(oh my god!) to use t3-t4 weapons to beat it?
And if we're talking about Patty (you can beat HoE by killing Patty too if you didn't know) - then you don't even need a berserker and anybody with hammer/eviscerator at all. Medic is more than enough, and from my experience if you play carefully having med pistols is fine too.