Because instilling the right culture is much more likely to produce great tech.
It's simply that with the proliferation of cloud based services, and solutions that you can get off the shelf...
... why would you?
Unless you had a specific business critical reason, then you are wasting time and money.
So doing that due diligence is key as well. Assuming that you understand it because it looks like something else is laziness.
Know your tools!
It's amazing what solutions can be found within constraints