Wikipedia is not forced unto the world as everyone's only source of knowledge.
Unicode on the other hand is the only way many people have to input and see text in their native language. When one group proposes being the ultimate solution to everyone's problems, and then pushes their standard forward as such, complaints about inadequacies in the solution presented are perfectly fair and valid.
Unicode is not "forced" unto the world either. It's just a good way to do the thing it does, but it doesn't happen without contribution from those who are impacted.
The word is "unicode". "Uni" as in "united". Wikipedia doesn't claim to be the One True Encyclopedia, but with Unicode it's literally right there in the name.
<s>Why is Wikipedia not doing more to translate the 4.7M articles into Bengali? It does claim to be the world's encyclopedia!</s>