Great question — answering as the UphillTech team:
Consider the two ways you can be wrong here: you can omit it when the right thing is to include it, or include it when the right thing is to omit it. One is much worse than the other. If you include it when you should omit it, you believe (without evidence, you've just heard horror stories) that it might delay your application. ("I will have to provide explanation for name change, reason for name change and they could ask additional documents too. I've also heard from people that they keep applications on hold for months because of this as well." and "they put your application on hold and do very lengthy background checks and ask dozens of documents on previous name, and all this for...
Full answer by Kate Gregory: https://travel.stackexchange.com/a/161377 (CC BY-SA 4.0).
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