The RISC-V implementation on RP2350 does not have any security features - it has no business to be on silicon that was supposed to be marketed for security features, but it is there. Then there are bits to disable ARM and/or RV cores, but disabling the ARM core takes priority over disabling insecure RV core - these are human decisions not architectural.

This isn't about the technology - the organization's priorities are clearly divided between two segments - one that's trying to expand the revenue by expanding into enterprise/commercial market and another that is trying to stick-on cool stuff and prioritizing fun. In this case neither won - the fun guys got kneecapped by the E9 bug making this silicon unusable for hobbyist projects, and the fun stuff kneecapped the enterprise stuff by bypassing the security bit.

(as you can imaging, I'm extremely disappointed with RP2350 - RPi needs to focus or they hobby/maker market is done)