They are certainly a terrible substitute for actually going out and meeting people - particularly if that's through mutual friends who know you both and believe you may work well together.
I never met any girl by "going out". Perhaps you could explain how that works. Nor was I ever introduced to one by a mutual friend. I have been in hobby and sports clubs, but the girls were either non-existent, another member's partner or outnumbered like 5 or 10:1 by the men, most of whom had more charm than me (
even especially if already married). I tried approaching girls at night clubs but was told to get lost - and I'm not even bad looking, just not flashy or fashionable enough for the sort of girls in night clubs I suppose. What else? - walk up in the street?
I did a calculation once, extrapolating from my experience with dating services, that showed that I would have needed to approach about five hundred girls of my own age to have had a 50% chance of finding a steady GF, if the approach was made at random *.
maybe talking to friends who are in relationships already for advice on what worked and what didn't
Their stories of how they met is always the same:
"Oh, it was unusual circumstances ....". Seems I never been in any unusual circumstances.
How did people meet before apps? Usually at social events or something like that, sometimes at uni, work or nightclubs etc.
I didn't. I went from about 13 to 24 without having even a conversation with a girl of my own age. After that I joined dating services and never met ones any other way. I met Mrs L that way. Forget uni or work, I'm an engineer so hardly any girls there.
I grew up in a time before dating apps and you met people through the other people that you knew in your wider circle of friends, or people that you worked with
Might have worked for you, but not for me (or many others). Everyone else I knew when single was also male and single, and had the same problem - not enough girls around. If they had been lucky enough to come across one, they were hardly likely to introduce her to me. As for relatives, they seemed to assume that because I had no GF I could not be interested, in fact one said as much (I should have given him what-for).
When I did meet girls (by then in our late 20s) I realised that one of the demographic problems with finding partners, despite the two sexes being in equal numbers, was that large numbers of girls are single mothers (including some I met) which makes it difficult for them to date anyone unless they can afford baby-sitters, which most can't. The corresponding "single" fathers on the other hand are are as fancy-free as ever, or at least they are free to pose as such - not only that, they are the most charming guys too.
* For example, about 75% would not even be looking for a boyfriend. At least with a dating service there will be a better chance than that, even if not 100%.