What is happening here? Has Shure kept the name but changed the IEM? The SE215s can be criticised for overly emphasised bass and for some high frequency roll off but they very definitely do not produce recessed midrange or vocals. In fact the opposite is true, is remarked upon by numerous reviewers and is confirmed by measured frequency response. I listen to a lot of choral and vocal music and if there is one phrase that doesn't accurately describe the SE215 it is "vocals are recessed"!
I actually don't think that Shure changed the product while keeping the name but do think it's possible that:
a) there are counterfeit products on sale
b) a few people can't achieve a good fit and so can't get a good sound from the product
c) some people have trouble identifying the characteristics and choosing the appropriate descriptive terms
d) some people come to the product from IEMs or headphones with very differently coloured sound which they have mistakenly come to perceive as neutral.
I'm not exactly a Shure SE215 fanboy as, while I enjoy them, I do think criticisms of their bass response and rolled off highs have merit. At home or somewhere quiet I use something else but on the street or anywhere noisy I think their sound signature and isolation make for an exceptional product. They sing