I usually delete randomly added people (who add me after some dungeon and such) when I don't communicate with them for a month or two, what's the point to keep them if we are not really freinds. And then half year later I get a tell from someone 'hey, can you help with this' and I'm like 'Huh... who is it?..' So yes, it's an issue for me. I have only around 10 active friends but probably in 50-70 other random people's friendlists.