Yes, agree. Also, SDKs are quite expensive - while GPU vendors give theirs away for free. This might be one reason for relatively low adoption vs GPU.
Xilinx is the leader in FPGAs and their tools are free. Lattice tools are also free. Not sure about Altera, who is #2.
I've worked multiple places that shipped products using only the FPGA vendor's free offerings. The FPGA vendors see the tools as a way to sell silicon.