I've been looking into installing Wine on Ubuntu and the official wiki says that if I have a 64 bit Ubuntu machine I need to carry out a few back flips and install 32 bit Wine. This shouldn't be an issue since there's plenty of material on how to do that but what I'm missing is the why.
This provides some clues but unfortunately no sources or concrete cases to look at. I'm looking for some reading material to educate myself a bit on this matter before I decide how and what to do next.
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This question has been marked as a potential duplicate of How to force Wine into acting like 32-bit Windows on 64-bit Ubuntu?. Just by looking at the title of the question you can see that we're asking totally different things. Although the "duplicate" has some relevant info in the various answers that it received, it is a very specific case of someone wanting to force Wine to work in 32 bit and this is entirely not what I'm asking here.
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My two main questions are:
A) In what cases do I need a 32 bit installation? Any 64 bit Ubuntu? Only if I want to run 32 bit windows applications?
B) If not in all cases then what is the benefit of having 32 (and/or 64?) Wines? Pros? Cons?