The "new ideas are fragile" is certainly true. I'm struggling with something I'm building which I think is extremely cool but technically difficult, but which if based on the reaction of friends and family I'd abandoned long ago. Only after having worked on it for 2 years and really got it working technically did I see a small spark in my dad's eyes as he said "oh, you can make MONEY off of this?". I feel like I have a strong internal compass but I have to admit external validation is needed at some point, but I noticed some people I just cannot share ideas with. They're in the habit of shooting down anything, and they would have found 100 reasons that any famous company or product would have failed. Unsurprisingly these people have not achieved much themselves, never taking any risk.