All my EDC folders have lanyards, just to ensure I can fish them out of my pocket easily.
Anything with a deep sheath, like scandi's and bushcrafters also all have lanyards, for ease of retrieval from the sheath.
But I don't like lanyards on stuff that don't need it.
I only put lanyards on fixed blades, especially the larger ones that might use to chop with. I don't bother with pocketknives; I don't want extra crap hanging off me that might get snagged on something.