You didn't tip for X in 2003 or 2013 -- should you tip for X in 2023?

I assume plumbers, electricians, painters, service technicians, etc fall under "transactional services". There was 1 that got me when I went to pay for a new water heater, the total was $3300 and there was a tip line with 10% recommended. A $330 tip? I gave the 2 guys $20 each.
I've not seen a tip line -- yet -- on a tradesman's invoice. Nor a moving service invoice (though I've not hired movers in over 20 years).

A little "thank you" seems common with tradesmen and movers (more movers). Tradesmen who are their own proprietors, though, usually don't accept cash tips since they can set their own rates. Accept a 12-pack, or a handle? More likely.