Well, this is a (relatively) old Thunderbolt-3 style dock. Thunderbolt 4/5 docks typically have 2-3 downstream Thunderbolt ports.
Ultimately though - USB-A ports are cheaper to implement - both in terms of cost and i/o & power resources - than full-featured USB-C ports with support for video, USB3.2x2 and higher power delivery. Even more so c.f. USB4/Thunderbolt ports (&. multiple downstream TB ports weren't even possible until USB4/TB4). I suspect that even a minimal USB 3.2x1-only USB-C port is more expensive that USB A - and doesn't offer any performance advantage over USB-A. So it comes down to who gets to use a dongle...
As for demand, your mileage may vary. The only things I have that needs USB-C are my TB hub and USB-C displays... (and even the displays are debatable since they'd work perfectly well with DisplayPort, and while they'd need a second USB cable to support the internal hub, that would then support USB 3 rather than being limited to USB 2). I think I've maybe got one SSD that supports USB 3.2g2x2, but Mac doesn't support that mode anyhow. The USB A ports on my Caldigit hub support 10Gbps, though. Aside from that, many of my peripherals are USB 2. Basically, while I could look for a multi-USB-C hub, and replace a lot of USB A-to-B/microB cables, there is zero incentive to do that.
I think Apple scored a bit of an own goal back in 2016 by prematurely going all-USB-C on the MBP rather than just upgrading the TB2/MiniDP ports and keeping the rest - it created a huge market for hubs/docks/multiport adapters that focussed on restoring the so-called 'legacy' ports.