Yes, confirmation bias is a thing.
You're desiring a negative to be proven to you. Like, prove that Santa Claus does not exist; it can't be done.
What is your qualifications for determining it has not been studied enough?
Or are you just assuming/fearmongering?
Not sure what that has to do with anything, CRTs is an entirely unrelated thing to bluetooth wireless tech. Also, many CRTs defaulted to 72/75Hz to avoid flickering.
While I tend to agree with you most of what you've said, I do believe there could be some safety concerns regarding heavy Bluetooth use. Up to this point, most scientific studies regarding cellphones/Bluetooth usage don't measure usage at the level that most people in today's society use these devices. I've seen studies that measure average usage as 20min a day, which by today's standards would be considered rather lite usage for many people. Now my guess is that since many of these studies started or completely took play in the 90s- mid 2000's researchers used these metrics because cellphone usage wasn't as prevalent at the time.
While most studies proclaim cellphones and Bluetooth devices safe, many of them note a higher cancer rate in the heaviest of users. Now Bluetooth headphones are meant to be listened and used for hours on end. I know many people like myself will use headphones at work resulting in hours and hours of usage each day. Headphones by design are for heavy usage.
If these studies are to be believed, then the new, unstudied, Bluetooth headphone market could cause major issues. I'm hoping some of the newer studies that they are doing will take into consideration this new market and conduct more studies on real world heavy usage.
With all that be said, I'm going to reserve complete judgment until more research comes out.
Below are links to a couple studies that suggest these findings(site listed is a database website that links to over 20k articles on this matter. Each link will take you to a different study):
https://www.emf-portal.org/en/article/18215 - (calls 5hr/day usage implausible)
https://www.emf-portal.org/en/article/18715 - (calls 20min/day usage average)