I'll start by saying my pattern (so far) has not been to develop long-term frequent relationships...I might if I found the right chemistry. That said, I don't have nor think it a reasonable expectation of regular communication with a provider outside of your business relationship. If the provider (and you) establish and like that communication...it's icing on the cake. Some will seek this communication, others not. Providers are deluged all day (and night probably) with communications probably 90% of which is flakes and people who don't follow-thru. I wouldn't blame them for wanting some "unplugged" time. I know for me, as an Introvert, by the end of the day at work I need to not talk to people for a little while - I need to recharge my batteries.
I have a provider I have see only once who sends me a text once a week or so "Hi handsome thinking of you" "remembering our time together" etc. It's a nice touch and coming from this particular provider (HOT AF) it makes my loins squirm a little every time I get such a message. No, I'm not imagining it to be more than it is - it's playful banter, and a smart provider keeping his client engaged and feeling good about their next visit. I did not ask for or seek this "after the deed" communication but enjoy and welcome it; I also probably wouldn't want it to be more than it is. I don't expect it which is why it's a welcome surprise when my WhatsApp says I have a message - and I open the app and it's him.