Ovinomancer
No flips for you!
Some find illogical tropes to be in the "not so" fun category. As a player, I like to believe the world has a reasonable order so I can make meaningful decisions within it. Obviously ridiculous things (like the sole guards on the royal family being idiots and the weakest of their kind) rub wrong. As a DM, it would really bother me. However, as a DM, I can fix it. Royal family guards are tough and competent or the royals don't live. The guards on the back gate of the city are an appropriate place for the bumblers.I just don't think most people consider Hill Giant guards to be a huge problem, I personally have no problems with guards not being the sharpest knives in the drawer. Easily fooled and bamboozled guards is a staple of movies and fiction.
And in the larger view for me, things making perfect sense is way behind making things fun at the game table. I never had problems with "illogical" dungeons if they were fun to run though and made for cool encounters.