[forgotmyoldname]

> then why should we use their frameworks and tools?

Because job postings demand X years experience in Y framework instead of looking for actual skills, and many investors look for hot things that are jumping on Z hip new tech buzzword and not all look at what they actually solve.

Plus to a certain extent they can be used to get a project off the ground faster. Although at a certain point a good number of projects that are successfully taking off would benefit from a nice rewrite--but that's not as sexy and marketable as adding another new feature in that same time span.