Mistakes get smaller and winning margins subtler as skill level increases between equal opponents, and a good game not infrequently extends to the endgame.
It seems you disagree but many (most?) serious players find the endgame intriguing. Deep and beautiful at times, and yes perhaps it takes a chess education to appreciate it. Not always though, and some just like endgames from day 1.
This has probably been said before, but-
A lot of times someone will showcase a game they played and you'll start flipping through the moves and think, "Well I'd better check how many moves this is." and it turns out its like 50 or 60 or something. Then you flip to the end position and its total of 5 pieces on the board and the winner had an extra pawn or minor piece so that's why they won.
Sort of renders all that preceded it kind of pointless. Obviously neither opponent was able to exercise any decisive tactic or strategy earlier, or at least none that wasn't neutralized or marginalized. It was essentially a war of attrition where no side was able to get the upper hand.
Imagine some battle from the Civil War or World War I possibly, and there is unbelievable carnage on both sides but the opposing generals obstinately fight on eventually killing 85% of battlefield contestants. Eventually one side retreats, leaving a few staggering shell-shocked survivors on the other side as the "victors". In the history books they won't be talking about the brilliance of either general. They'll be talking about the battle as an example of the Evils of War.
I personally dislike the end game so much I'll often impulsively initiate some drastic or ill-advised sacrifice or strategem to open up the board and bring the game to a conclusion. I have at times essentially handed my opponent the win just to avoid the end game.
I don't want to see a couple of opponents just blindly trade all their pieces off the board, and get into a stupid interminable dance involving maybe a king a pawn and a piece on either side. A real chess game is one where most of the pieces are still on the board. If you were unable to navigate the complexities of that scenario and come up with a win, why bother showcasing it.
The only time an end game is worth watching is if one opponent was down very substantial material earlier and fought on to win. OTOH, I don't think its good form to get down a huge amount of material very early through stupidity and then simply stop moving, so your opponent becomes disengaged through boredom, and maybe eventually loses himself.
Like I said this is just a rant. Someone undoubtedly could make a valid opposing argument.