Compared to YC companies, they are way ahead on SEO and other web marketing strategy. YC demo day companies tend to suck at SEO in obvious ways.
If we are going to "pump" up the SEO factor, things like https://www.yourmechanic.com/book/#/addj=10021 for "Car is not starting" would not be in place.
Instead, maybe something like https://www.yourmechanic.com/fix/10021/car-is-not-starting
So yeah, I wouldn't necessarily hold this site up as heavily SEO optimized. Nothing against the company as they are a young company just not a good example IMO.
I'll now call out YC companies to prove my point. I went to the techcrunch demo day round 1, and have a look at http://vastrm.com/ It is a complete SEO disaster. No reasonable advisor would have said that was a good idea for an e-commerce company.
Compare their SEO strategy to a YC company that repairs iPhones, or the one that sells cars. If you don't know the urls, send me an email and I'll tell you the ones I am talking about.
The YC anti-SEO pattern exists, it is just not polite to call out SEO mistakes, because if anyone builds anything, then we must be supportive.