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The Ryzen 7 2700X chip I bought back in 2018 is still fairly close to the latest Ryzen 9 chips in terms of single-core performance on benchmarks (within 10% IIRC). The Ryzen 7 is an 8-core (16 thread) CPU, and now you can get 12 or 16 core Ryzen 9's, but most workloads don't take proper advantage of even an 8-core machine.

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Quick online research shows a 30%-40% single core improvement from the 2700X to the 5700X, and a 40% to 50% (single core) improvement to the 5900X. Maybe you have a specific weird workload that isn't improved much, but performance improvement for the average workload is much better than 10%.

This is only in benchmarks.

Most workloads don't even take proper advantage of more than 1 core. Single core performance is still the most important metric and there hasn't been anything exciting regarding that in the last... 15 years?

This is true. However your workload runs in a multitasking OS which, at least for Win 10, needs at least a core only for itself.

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