Pretty much. Swords are all but useless against plate armor, so it’s mostly wrestling and trying to find a gap between the plates you can shove something pointy in.Looks like swords were pretty much incidental to the whole thing. Mostly it's armoured wrestling. (But of course "King Arthur and the Wrestlers of the Round Table" doesn't have the same ring. Not to mention where that leaves Excalibur.)
Yeah, I have seen several such videos online. That is why not having DEX mod for heavy armor is dumb IMO.
That’s about game balance rather than realism. If it needs an explanation, you can say that heavy armor doesn’t add Dex not because it’s difficult to move in, but because it’s protective enough that being agile doesn’t meaningfully improve your chances of avoiding harm in it. I mean, look at the way the dude in the video just stands there and tanks that big golf swing from the sword. I think it might have actually been more tiring to bother trying to dodge that than to just take it.Yeah, I have seen several such videos online. That is why not having DEX mod for heavy armor is dumb IMO.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.