I've uploaded some files using js-ipfs without converting it into Buffer or Readable stream, and it works just fine.
since IPFS converts the file into blocks anyway, why use buffer/stream!
what are the pros and cons of this?
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That depends on the service you use to upload the files. They may have different requirements, but the end result is the same.
Using buffers/streams is mostly useful if you're dealing with lots of data and/or in an environment where memory is limited. Streaming data means you don't transfer all at once, but send smaller pieces all the time. That wait the recipient doesn't need to accept a big file at once, which may drain resources.