I looked at it too, and if you are a disabled vet, you can get it. 100% free. I got out of the service in 1982, and was labeled with a 10% disability in November of 2013. 31 years later.
The only reason I looked into getting VA healthcare is so I could get a veteran's ID card, so that I could get 10% off at Home Depot and Lowes. I initially did not even consider I was disabled. The application was successful, and it got me my Home Depot discount and free healthcare. Plus a small monthly tax-free stipend.
If you worked in any type of noise environment in the service, see your county Veterans Affairs office. I have mentioned this to several people, and they all got 10% disability and VA care.
Your experience is quite different from my father's and my father-in-laws.
My father in law was a purple heart WWII vet. He had gangrene so bad on his feet (from walking in semi-freezing mud in the battle of the bulge) that they almost amputated both feet. Fortunately they were able to save the feet but he had permanent nerve damage. He was classified as 20% disabled. The VA provided an umbrella of insurance - but they billed his medicare then his secondary insurance (federal retiree BCBS) for anything not specific to his VA noted disability. VA did not cover him 100%.
My father was a radar tech in the AF during the Korean conflict. Like you - hearing damage from working on/maintaining equipment on the airstrip. He didn't have tinnitus - but did have significant hearing damage directly associated with his service. The VA provided him, 100%, with hearing aides, periodic hearing tests, etc... but nothing more than that. He had to have regular medical insurance to cover everything else.
Perhaps it's the different era's they served... WWII and Korean conflict. But those are my family's experience - which sound quite different than yours.
(Neither got disability pension, either.)
I'm happy for you for gaining the benefits you did - but they seem out of the norm.