I had to buy carpets to hide the cable under them when running across the floor. Only exposed parts go through the doorways, and the wife complains about them. Well, I am not complaining about our craptastic wifi anymore.
If you own your house you could learn to pull cable and how to do punchdowns. It's not a super difficult job. That way you could impress the lady of the house with your technical skills while also hiding the mess.
In my experience, the part about hiding the mess is all she cared about, as long as "the internet still works."
But you will always look at that wall jack and feel great about it while always having the lowest latency and highest throughput you can possibly get, and that will always impress yourself!
Honestly for newbies I always recommend inline couplers instead of punchdowns. Still meets electrical code in areas where you can't run a cable through a wall (wiring only) and allows for the use of non-crimped cables so the barrier to entry is far lower. It's not like most houses are at risk of hitting the length limits for Ethernet runs anyway.
Would they be able to prove it wasn’t installed by a licensed contractor? Ok, if you have it installed legally then you’ll likely have an invoice/receipt, but if you lose it that doesn’t mean the cable is illegal. So if you did it yourself, how would they know it’s not just a case of a missing invoice?