I have a diametrically opposed take. I prefer tipping before.

It's my way of giving someone a little appreciation because they're (typically) doing a job I wouldn't want to do myself.

It's got virtually nothing to do with the quality of service I get. I always tip the same amount even when service is bad. There have only been maybe 3 exceptions in my nearly 3 decades of adult life.

I'm fortunate to be able to afford a little bit of generosity for service people, so I do it.

Edit: I should add that, in places where there's a customary tipping practice (eg: US restaurants), I tip above the customary amount no questions asked. The "generosity" is the amount above customary.