Does adding standard extensions result in similar complexity for the resulting core with similar features? The authors seem to address this:

> Fewer instructions. RISC-V has many fewer instructions. There are 50 in the base that are surprisingly similar in number and nature to the original RISC-I.30 The remaining standard extensions—M, A, F, and D—add 53 instructions, plus C added another 34, totaling 137. ARMv8 has more than 500; Fewer instruction formats. RISC-V has many fewer instruction formats, six, while ARMv8 has at least 14.