I didn't find facebook messenger relevant for me and for me it is a worst app.
I have to install it because facebook forces me to do so otherwise I can't be able to read messages. This is a crap from facebook.
I don't use it because it is way bulky than other messenger apps available in the market and facebook always give bulky updates for the app which doesn't make any sense.
Why anyone use this when way simpler messaging apps are available in the market and any age group can use it easily without much tutorials.
I don't find it relevant as it should be so dislike it.
