I'm not disagreeing with your logic, its sound.
Lots of things can & do make sence, just drawing a line in the sand between conjecture & fact.
Like I said, I use Blue LEDs too, & they look great.
Once I saw a Blue LED that had a dark Blue look to it when not powered-up.
I have never seen them since, but looked just like small dark blue "bumps".
Anyone elce seen them?