Based on your reaction so far, I’d say they are not essential. Later, I’d say Saxon is a band worth hearing when you want to hear them, but they aren’t essential to the development of the genre.
I’m at work, sitting in the dark backstage and waiting for bad things to happen, so it’s somewhat more difficult for me to link lots of songs right now, but if you look on YT for any of the bands I mentioned, you’ll likely find their most popular songs coming up at the top of the list.
If I’m getting this right, you were 14 in the early 1980s and were into punk rock?*
Well, if you listened to rock radio during that time, from like 1982-1988, you’ll recall lots of those bands I listed and their bigger songs once you start listening.
The thing to keep in mind is that eventually, because of money, the ballads became the thing for hair metal bands, but initially, they were more like turbo-charged rockers with no discernible philosophy other than “woot girls and beer (and drugs)!”
*FTR, I turned 14 in late 1980 and I was into punk rock, the punk rock that was too arty to be just punk that some people then called new wave, etc. and into '60s psychedelic rock. Gary Numan, The Clash, Jimi Hendrix, The Germs, DKs, X, XTC, Cramps, 13th Floor Elevators… heck I still listen to them, come to think of it.