Is Adam Smith’s “Specialization of Labor” model relevant in a service economy?

I’ve been mulling over this one for a while. In a manufacturing economy, the “One Man Making a Pin” example is clear as day. Does it make sense in a service economy?

For context, I was broke in college and for a while after graduating, and am happy to report I am now in the “High Earner Not Rich Yet” group. I got used to working on my own cars and houses, doing my own chores and taxes, and saving money however I could. I assumed I would get to an income eventually where it would no longer make sense to do everything myself, but it has not happened despite healthy career growth. Given I am earning a healthy income, this seems to contradict the idea that specialized labor brings costs down and efficiency up for everyone. Here are two personal examples:

1 - I replaced the fuel pump on my pickup. It took me about 5 hours plus about $200 in parts. The shops around me all quoted me around $1200. The only reason it took me so long is that I had to drop my fuel tank without access to a lift, which mechanics have. That puts my hourly rate at $200 / hour. That is on par with a consulting side-gig I have going, meaning even if I put extra hours into my highly specialized career path I would not come out ahead financially

2 - I redid the electrical in my fixer-upper house because it was dangerous and incorrect (neutral had 40v on it, lights were dim and flickering, un-grounded junction boxes and plugs). I won’t bore you with the details but this also came out to approximately $200 an hour, and it only took me so long because I had to keep running to the hardware store for tools I did not own. Same math as example 1.

This got me thinking: If an electrician and a mechanic both charge $200/hour, and the electrician fixes the mechanic’s house while the mechanic fixes the electrician’s car, both people loose after taxes/insurance/travel. Both people are better off fixing their own house/car and lose money by engaging in the specialized economy.

Even paying door dash $15 in fees to save 10 minutes of driving comes out to $90 an hour, and people do that all day long. Looking at the dollars per hour of landscaping services, snow removal services, car repairs, home repairs, home movers, CPAs, dog trainers, restaurants, it has me becoming a self sufficient hermit with a lot of new skills and saving a TON of money.

What gives? Is Adam Smith turning in his grave, or am I onto something here? Thank you.