They aren’t removed because they’re too hard, they’re removed because they’re inconvenient. They are removed when there is a more succinct and/or better understood alternative, for example “evolution” doesn’t have a good alternative to replace it. Memorizing relatively obscure words isn’t intellectual, and as simple building blocks as possible can often better communicate more complex ideas. There’s a reason C is better liked than C++

language evolving doesn’t make people dumber

There are plenty of pro-gun people outside the US too