I am not saying that they cannot find customers to sell things to, note you have not addressed a single point I made though
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We know that console owners have an upper limit in price and size of the console and we also know that CPU and GPU performance (and the semiconductor manufacturing improvements) are slowing down not speeding up (and the cost to achieve performance improvements is also going up) so it takes longer to achieve that at a reasonable price and power envelope.
We also see that on order to see marked improvements we need bigger and bigger performance jumps. We know designing a console iteration and selling it costs money.
What would releasing more HW more frequently actually help? It also adds more hardware profiles to target which means even more troubles for devs…