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It's depressing. This should be an age of new hardware, with near-memory computing and flexible architecture. Instead it's GPUs for the foreseeable future, Nvidia has a near monopoly, AMD seems uninterested (despite also owning Xilinx), and Intel's throwing in the towel.

I wanted to prototype a systolic array coupled with a DRAM slice to hold the weight matrix, but there's not even DRAM blocks distributed on any of the FPGAs I saw. I guess Xilinx has HBM but still not quite what I wanted.

Hold up, they didn't do nothing. They tried and failed. There were several attempts at packaging an FPGA with a CPU and none of them worked.

They tried a lot of things with Altera and failed. The real problem is the price they paid (it was more than $13B). At the time they bought it, Altera had net revenues of $0.5B. They simply paid too much to ever recoup the expense.