Maybe for the ass-end of the Boomer generation. Ozzy's solo debut dropped in December 1980 and the first Black Sabbath album was recorded in October 1969.
Black Sabbath’s first album came out when my Dad, who is Boomer to his core, was 20. In terms of their debut, they’re contemporaries of Led Zeppelin, Rod Stewart, David Bowie, Bruce Springsteen, and many more who recorded their first album within a year or so of Sabbath.
Just because they’re a Boomer band doesn’t mean they were well liked by Boomers.
Much like Zeppelin, many hated them. What they did was considered to be an abomination of the form. Going “hard” for the majority of material, rather than a song or two, was considered to be anti-intellectual and a stunting of rock ‘n roll. The wing of fans who wanted rock to evolve in the way the Beatles evolution occurred were appalled by Sabbath.
On one hand, that wing of rock fans had gone way too far up their own asses - the later punk movement was the most obvious counter-point to that attitude - but on the other hand, it came honestly.
We Gen Xers are lucky in that we can listen to all of this stuff in hindsight and pick up what we like and don’t like cafeteria-style. We can listen to Sabbath with the context of what happened since.
Boomers, of course, lived it all in the moment. Rock ‘n roll as we define it was only about 15 years old at the time. It was still being defined. Sabbath was part of that and a good example of something misunderstood in the moment.
On the other hand? Not everything they did was great. My biggest beef with Sabbath is their mixes often sound like ****. I popped “Sweet Leaf” on the other day, a remastered version at that, and it is so damn muddy. Even Iommi’s almighty guitar couldn’t escape it.