English cannot and will not and never will be perfect, nor pure or whatevs but it will get a message across. It is rather more flexible than your average language and that is probably a complete accident. There are loads of pidgins of English and a phenomenal number of dialects. This is just for "modern" English.
You can fiddle with word order and ignore quite a lot of word endings and still it hangs together.
This Anglish bollocks sounds like a roundly racist notion involving "purity". I hate that.