well...yeah. It does kind of suck, for the reasons you mentioned. I still appreciate it and even enjoy listening to it every once in a while at blues bars or wherever. Every song follows the same progression, solos are all in the same scale, there really isn't much in the songwriting. Its value, for me at least, comes from the fact that it's so simple. Blues is where i started as a musician and i'm sure a lot of others are in the same boat. You can pick up a guitar and play blues with people you've never met before. And i think music in general is valuable because it isn't exclusionary - everyone is invited to play and create and participate in this cool thing, and blues happens to be a genre that lends itself to that very well.

So i enjoy the blues. I do think it sucks, but i enjoy it. the same way i enjoy certain punk, hip-hop, folk, etc. Songs like "You Are My Sunshine" and "This Land Is Your Land" are also objectively pretty bland and not innovative but they're still awesome because of what they accomplish beyond the song itself.

My grandpa, the guy who taught me how to play bass, is really into blues. He was a gigging blues bassist for most of his life, and even now his entire record catalog is JUST blues. He listens to I IV V all day, every day. I appreciate blues but if i could never listen to anything else for the rest of my life I think i would literally go insane.