I own an iPhone 5. I'm on my fourth replacement since 2012. I've also inherited my wife's old iPhone 5, which my daughter used as her first phone. My iPhone 5 was my primary phone from 2012 to 2015.
I don't recall it wanting to be 'stuck' to my hand. I recall quite the opposite. Because it was small it often wanted to leave my hand. Of all the iPhones I own, it's the one I've dropped the most. As far as being 'much more grippable', now that I am used to bigger phones, I find it harder to hold smaller phones. Which makes it much LESS grippable to me.
I can only comment here on what I do because I don't own the iPhone 15 Pro. I do own the 11 Pro Max, my primary phone. Generally, the only tables I'm sitting at are at a restaurant. In a booth. If someone is bumping the table hard enough for a phone sitting at the center of the table to slide then everyone at the table has much BIGGER problems.
If I'm putting it on a table, it's back down. Lots of people like to put their phone down on the front (to protect the screen). Not me. If something is going to scratch, it's not going to be my screen. Generally, if I can set it on a napkin, or something else I will do that. Otherwise, it sits in my pocket at the table.
And I wear Dickies carpenter pants or shorts (depending on season) so there are large pockets. It's not going to slide out.