Who? Whom do you think I'm talking about?
ryacko is perfectly clearly stating that Electron reduces the amount of training that developers need. This is different from making them develop faster. It just makes them more replaceable.
I have no idea how to parse twobat's question. The "or" is especially confusing. I'm not surprised that ryacko is baffled by it.
Hence the training for "what" or for "who" not being immediately parseable.
Until @ryacko said "Whom do you think I'm talking about?", I wasn't sure either.
I still think asking "what or who?" with no other elaboration is really confusing. It's such a vague question that you have to guess how to answer, and it's super easy to answer it in a way that doesn't satisfy what the asker actually meant to ask.