Two other random observations about the differences between using matching sites versus people I've met more organically: Those I've met online are at least twice as likely taking prescription medicine for social anxiety or other mental health conditions. That difference is quite stark but otherwise personality and lifestyle differences are minimal. The other is that tall women are vastly overrepresented on dating sites. My guess is that if you're a 6' tall woman who wants to not be taller than her significant other but still wants to be able to wear heels, the numbers don't work very well with more traditional dating. You have to be able to cast a wide net when 96% of men are already shorter than you are in two inch heels.
For myself, my best relationships have been those I've met in person rather than through online dating. In most of those cases, we wouldn't have been a match if we had been using an app and running in similar social circles itself was a good filter. The best relationship from someone I met online was a woman I met on LiveJournal in an alumni area, which was somewhat of a pseudo social circle filter itself.