If you guys have "friends" or "guildies" that are willing to play when you want to play, fantastic, go play with them. If they ditch you for a dungeon finder, that means you weren't a desirable friend/guildy to begin with.
funny that people complain that you always have to wait for a tank/healer even with such a system, and one of the reasons is a lot of tanks/healers don't do pugs. I ask friendly DDs to group with me and vice versa. or DDs spamming chat (sounds familiar?) to group with a tank/heal because they don't want to wait hours.
and, ofc that other games do fine actually without any lfg-tool.
could it be improved? definitely. does it need the lazy-one button solution? no.