As a friend and coworker liked to say, "speed kills", and Google is right that it's a risk, just one a lot of people are willing to take.

Every company with high performance single thread designs has out-of-order with speculative execution designs, ARM, AMD, IBM POWER and mainframe/Z, Intel, MIPS, and SPARC. RISC-V is working on it, with the Berkeley Out-of-Order Machine (BOOM) and perhaps other cores.

And doing research I should have done a long time ago, SPARC V9 has Spectre vulnerabilities (https://www.zdnet.com/article/meltdown-spectre-oracles-criti...), and MIPS made a statement that a couple of their designs were possibly vulnerable (https://www.mips.com/blog/mips-response-on-speculative-execu... and this followup assumes that: https://www.mips.com/forums/topic/mips-mitigations-for-side-...)