Er... what? The SoC has received multiple major updates. The Pi 3+ has a a quad-core, 64-bit SoC -- it's the same SoC family as the one in the original Pi, but a rather different CPU core.
that doesn't mean anything, other than that it runs arm64. in every other way it's nowhere close to A11.
I wish there was a Raspberry Pi 4 with 2x USB 2.0, 1xUSB 3.0, 1xUSB-C 3.0, Gigabit Ethernet and 802.11ac.
That all being said, I feel like what you're looking for is a small-form-factor computer, not a development board. :)
Major features
2x A72 + 4x a53. (4000 in geekbench)
mini PCIe connector/PCIe x4 (supports SATA expansion card)
USB 3.0
Prices
Rockpro64 2GB board, $59-65
Rockpro64 4GB board, $79
Rockpro64-AI 4GB board, $99