I'm not trying to change your mind in liking them, but there are a number of legit reasons to have them. There are also some pure money reasons.
Last generation, video games suddenly looked worse if you upgraded your TV. Upgrades in technology were making LCDs much cheaper, which made big TVs cheap, and high res LCDs possible. Low end customers were getting bigger TVs. High end customers were replacing their 1080p plasma TVs with inferior LCDs but that had 4K support. Sony, which also happens to make TVs, was selling gamers on a high end screen that made their games look worse.
Mid-gen consoles fixed that problem. And they allowed the cross-gen period to last longer, because there was a class of 8th gen hardware that could decently run 9th gen games. Which you might not like personally, but increases the number of people who can buy the games, which means more games can be profitable - fewer layoffs, more games.
It didn't complicate development, because Sony and Microsoft's platform is chock full of PC multiplats, including most of the games they publish themeselves. The things that make it possible to scale to a Pro console are baked into a PC development cycle.
If the consoles aren't useful to the developers, and aren't useful to gamers, then their existence won't affect the industry too much, and if they do affect the industry, it's because the industry saw them as useful. I think the PS6 is a dumb idea, personally, but there is a technological argument.
Last gen devices were not well positioned relative to the market, when they came out. Xbox Series and PS5 were much better positioned, they should have stayed relevant longer. But both of them are so tied to the PC multiplat experience, where Nvidia dominates, and Nvidia changed the game. RT performance on the consoles is weak, and they don't have the dedicated upscaling support that Nvidia does, but those technologies are already standard on PC.
By the time the next generation comes around, you'll not just have a performance leap, you'll have a performance leap plus new upscaling hardware, plus a couple of generational leaps in RT. You could argue that Sony needs a Pro to keep getting decent PC ports, and to insure there is any sort of cross-gen period at all.