It's simple - they are jealous. They don't have the skills to build, so they buy certificated.
(No, Doc B, you are not allowed to stir that pot... leave it alone...)
Of course I mean the above to be tongue-in-cheek. Every aircraft owner has a different mission, different personality (though some on here seem to have NO personality), different budget, different hobby likes and dislikes, different skillsets, and different levels of risk-acceptance. The experimental world is certainly the "road less travelled", but it is not any less capable by any means. If the aircraft fits the mission, fly it.
I'm an RV builder, not an RV cheerleader. I can't put a 500-pound wild boar that I shot in the back passenger area and fly out of a riverbed with it. I can't move bedroom furniture in it. I can't go FIKI with it. I can't realistically expect to ever enjoy a 100-knot tailwind at FL250 with it. My typical flight profile doesn't need any of the those things - so they were never considered when I chose what aircraft I wanted to build. All this BS about one airplane versus another seems to me to be just a bunch of attempts to pound a square peg in a round hole. Fly what fits the mission.
Now just shut up and go fly already!