If you mean for ARM based systems (not just SBCs), I would agree, but the software and support ecosystems for amd64 systems far surpasses even the rPi ecosystem because you have backwards compatibility with a lot of the legacy x86-64 and x86 code. And because they support UEFI, distributions don’t need to explicitly support your particular version of your ARM processor so you can run pretty much whatever OS you want.

Not long ago I saw a one of those old small Dell Optiplex workstations with a 4th gen i3, 8GB ram and a 256GB SSD on Amazon for $100 USD. There’s a new BeeLink with an N100, 16 GB RAM, and 500 GB SSD for $200. They’d both be great for any home lab project that doesn’t need the GPIO of the rPi. And they are both in the same price range.

Don’t get me wrong, if I needed to kitbash a desktop or small server together in a hurry, I would probably be using a Pi3 or Pi4 because I’ve 6 of them collecting dust from when my self hosted services outgrew their available compute. I replaced them with a keyboard damaged laptop with a 6th gen i5 and my old desktop with a 4th gen i5. But if I needed to buy something today, I’d be doing some price comparisons first.

If you like Pi’s, use them. They are great kit. But if price or (more recently) power consumption are your primary consideration, it’s no longer as simple a choice as it was pre-pandemic. It’s worth looking around now.

Of course, none of this applies if you need the GPIO. But then you’re looking for project boards, not desktop or home server systems. Different set of criteria. And a different set of head aches.