They’re still useful, but they’re not competitive in overall performance with recent CPUs in the same category. They do still compete with some of the budget and power-efficient CPUs, but they use more power and get hotter.

That said, those 4th gen Intel CPUs are indeed good enough for most everyday computing tasks. They won’t run Windows 11 because MS locks them out, but they will feel adequately fast unless you’re doing pretty demanding stuff.

I still have an i5-2400, an i7-4770K and an i7-6700 for occasional or server use, and my i7-8550U laptop runs great with Linux (though it overheated with Windows).

I buy AMD now though.