There are roughly three named "ages" of English (in England): old, middle and modern. I can just about understand written middle English and have severe problems with old English.
Modern English can be very flexible, which is probably why it has become popular as a lingua franca. There are no real noun genders. Word order can be fiddled with mercilessly too. Officially, English sentences are subject - verb - object (SVO) for example: "I sat on the bed". You can say "I the bed sat on" or "On the bed sat I" or "sat I on the bed" and it still works fine. Most of those variants are regionally correct, somewhere.
English spelling is an absolute nightmare! Linking pronunciation to spelling is absolutely awful. I can completely understand English as a second language speakers throwing their hands up in the air and declaring the whole thing as complete bollocks! However, that means that we are extraordinarily tolerent of speling mistaks. field or feild? sealed or ceiled? Who nose!
You have the causality backwards here.
> Word order can be fiddled with mercilessly too. Officially, English sentences are subject - verb - object (SVO) for example: "I sat on the bed". You can say "I the bed sat on" or "On the bed sat I" or "sat I on the bed" and it still works fine.
This is just incorrect.
There was more than that. For a while, England was a backwater of the Angevin empire and kings of England were native French speakers for quite a long time.
The medieval English and the modern English are completely different. Medieval French and modern French, not so much.