Seems a reasonable philosophy. I don’t evny the shop guys in this type of situation. There are a lot of mistreated bikes out there. I have been standing in shops more than once, waiting my turn with the mechanics, while some customer with some absurdly mistreated bike argued that the mechanic should be able to do this or that to get the bike working at 1/2 the price or in 1/4 of the time the shop had quoted.
I've made my fair share of mistakes on customer bikes, a good shop always has your back, even when you ****ed up.
It doesn't cost that much money in the long run to fix whatever is broken and to keep a customer. Unless you were a customer they didn't want, lol.