I guess my genuine question then is why does this thread exist if DIY is so encouraged? There is something keeping new builders away, just trying to tease out what that is.
With respect, I think Fallen Angel has indicated this thread has the answers.
Look ... any individual with an inkling of DIY enters a decision path about whether a product is something he/she should build or purchase. For those die-hard scratch-builders - probably like yourself and me - they would never buy anything but build, instead. Then of course, there are those who would never consider building anything.
In between, there is an entire group of people who
might consider DIY, but make a decision between those two paths (build or buy). These days, the market and economics are simply not there for the majority of those who might waffle. DIY requires a heavy initial investment, unless they are blessed with a family who collected tools that got handed down. Plus, companies in Asia and Schiit in the US build new products for lower price, with more features, more marketing, more advertising than any DIY outlet/builder can manage. In the face of all of that, the waffling potential builder goes down the "buy" path instead of the "build" one. Yes, I still believe (and probably you, too) that anything I can build is superior to what I can buy, but that is not an opinion that often rises above the level of the marketing/advertising noise.
The result is that there are fewer and fewer DIY-ers. There is no active discouragement happening against DIY (unless you count the end of group buys around here) - just economic facts.
P.S. My original list of reasons earlier in this thread detail many historical events that have resulted in dwindling DIY-ers, but they all point to the same thing: economics and a maturing industry.