I didn't play 4e so I had to look that up. This is not the same issue. Are they both kinda sorta under the header of fun? Yep. The entire game is. Having someone roll to hit a door, though, isn't the same as encountering guards at the gate. I've known many, many DMs who have gate guards, but not one that has had someone roll to stab a door. At least not outside the rare joke roll that wasn't to see anything other than answer, "You hit the door" no matter what was rolled.
The gate guard advice, by the way, is bad advice. Gate guards are a fantastic resource for the PCs when arriving at a new city. The guards ask them where they are from and what they are doing and then usher them inside. It takes all of 10-30 seconds. UNLESS!!!! The players want to know where something is. Often they will ask the name of a good tavern, or where the blacksmith is, or... If the encounter with the guards goes longer than 30 seconds, it's because the players wanted it to be longer. Once the group is familiar with a city, the guards can and should be ignored unless important to the story somehow.
Good gate guard advice would have been advice on when to encounter the guards and when not to, as well as advice on length of time for such an encounter and ways that the guards can help the PCs.
The 4e DMG, though, telling players that it's bad wrong fun to have a good encounter with guards at the gate. It is straight up saying that all gate guard encounters aren't fun.
Yes, it's a bad example because it's not qualified. It says "bypass this encounter" without really getting into what is bad about it. The writer seemed to think the reader would just grok that. And you know, I did. And I think some of the people who claim they didn't were happy to pounce on things they didn't like about 4e- that's human nature. Not all! I'm sure there's a lot of people who didn't grok it, or legitimately felt it was an attack on their style of gaming! I recently compiled a list of valid reasons not to like 4e- there's a lot of them.
But usually the ones cited are a little silly.
If the two gate guards have no useful information, are a trivial obstacle to bypass, and the only relevant outcome is "the Cleric might have to kiss the Fighter's little owie from a lucky hit"- I see no issue with bypassing that.
But as I said upthread- if the guards really do have relevance, then no, of course you shouldn't skip the encounter. But "relevance" is, well, relative.
Some DM's might feel having an encounter with gate guards simply adds flavor to the game. Makes the game world feel more real and interactive. Or maybe just want to slip in an amusing moment to entertain the players, like the gate guards in
Romeo and Juliet ("I do not bite my thumb at you, Sir, but I do bite my thumb!"). To them, that's not irrelevant. If their players enjoy it, it's not irrelevant.
Now sure, yeah, this is time spent not adventuring, but whether or not it's time well spent is dependent on the individual. I might enjoy it. I might not..
Hussar, by all accounts definitely wouldn't.
Someone else would think that was fantastic and talk about the moment for years to come!
NONE OF US IS WRONG. D&D is for everyone.
But! If you have players who do very much want to get on with the adventure, and they make you aware of that, you should examine whether or not you're fine with speeding things up a little. And if not, both you and that player may need to part ways.