I’ve come around to really liking them. In short, they vastly improve dungeons in my opinion.

Most RPGs don’t manage to create interesting battles outside of boss fights. Heck, an increasing amount of RPGs fails to create any kind of challange. However, random encounter can add another layer to dungeons: resource management. You have to plan out how to tackle fights in order to get through the dungeons with your limited items/MP - do you sacrifice more HP or do you go for your strongest attacks? How much exploration can you get in? Do you need to be extra careful and plan for stronger rare encounters? Maybe even plan around lvl up healing.

Sadly, this layer is easily removed. Overworld encounter? Just dodge everything. Adjustable encounter? Grind just enough, go heal and disable encounter. Non-challanging fight? Just use basic attacks. Healing stations? No need to plan anymore. Ideally, the dungeons provides no healing at all - especially not before encountering the boss.

If you’re interested in a game with great dungeons, I’d recommend every single Etrian Odyssey.