I've been looking into converting my old PC into a server/NAS and it makes me realise how bad the connectivity on modern motherboards is (especially for building server/NAS). It's crazy to see my current B650E-E has half the number of SATA ports of the old Z97X board, while costing almost 2-3 times as much. Only a handful of B650 boards go above 4 SATA, only a handful of halo tier X670E get to 8 and shockingly X870 is worse, with all boards having 4 except for the X870E Taichi. Even the server grade boards are mostly limited to 4 SATA, outside of the odd exception to 6. Sure most of us are using M.2 for regular home builds, but it does mean that for servers and mass storage (for RAID/ZFS etc), PCIe SATA and ethernet expansion cards are a neccessity now. I also can't remember the last recent board with dual BIOS. Admittedly 2.5G ethernet is now standard, with many boards having better. That MSI Tomahawk is not too shabby with even 5G. And ECC support is more common.
PCIe is also not great, outside of the super expensive boards, it's rare to find a second slot that runs at x8. Also somewhat rare, but not strictly necessary is a second PCIe5 slot, I think the B650E-E is the only single chipset board that has another PCIe5. I guess the only impact is if needing to plug in a PCIe5 expansion card while having a GPU in the main slot, since most of the currently available PCIe5 stuff is non-GPU. Having a 3rd slot at x4 is also now rare outside of the pricier boards. I won't knock them down for the reduction in excessive PCIe x1 slots though, on the older boards most of the extra x1 were less useful PCIe2, so no big loss. Admittedly, some of the reduction in PCIe slots is due to an increased number of M.2 slots and there are some M.2 adaptors for things like ethernet or SATA, even if those are rare. But given how PCIe bandwidth works, surely it should have been possible to have older gen PCIe with more lanes, as opposed to newer gen PCIe with fewer lanes. Would be useful for 10G network cards, SATA expansion cards (to make up for the reduction in SATA ports) and other bits.
It's a shame that the variety has died down and most boards tend to follow the same trends for the same use-cases. Makes it difficult for folks wanting to do other things on these platforms.