I Was Reincarnated as a Commoner. I Can’t Stand Living Like This, so I’ll Become an Aristocrat! Chapter 12 Discussion

I am more than willing to suspend my disbelief with WNs and LNs. I don't blink when Rize Beibalon creates a black hole with cows. But you have to be internally consistent.

I thought it was bad when MC "invented" pancakes and his parents (they are cooks) got surprised. Because apparently nobody ever in the history of theirkind thought about making flat cake, an invention that can be traced to BC 30000 if not earlier in our world.

But no, I wasn't ready for the rest. MC meets with a magic shop owner. They have magical light bulbs but they are too s*upid to invent switches so they manually put and remove magic stones by hand. MC explains that with "if there are no machines, then there is no need for switches" except they do have machines. They have carriages (which require breaks), they have church bells.

He improves healing magic (treating cuts) by thinking about cells repairing themselves. Except that's not how that works. Your body creates new tissue while healing.

He improves fire magic by imagining fire burning oxygen. Oxygen is not flammable. Sure oxygen (or an oxidizing agent if you wanna be extra nitpicky) is required for fire but you can't burn oxygen.

"I also used the Body Enhancement magic to boost my speed by imagining an increase in muscle mass." Because we all know Usain Bolt is as swole as Arnold Schwarzenegger

And author expects me to believe that our MC is better magic caster because he has no idea how world works, should have flunked highschool and must have gotten into the university by cheating and nepotism?