I agree, this mode seems like something most people could manage without difficulty. Amusingly, my (non-Apple) system is much more locked down than this and is

I agree, this mode seems like something most people could manage without difficulty. Amusingly, my (non-Apple) system is much more locked down than this and isn't exactly unusuable IMO, although some things might be harder to manage on a phone. Microsoft did some tests for Edgium's "Super Duper Secure Mode" and found that disabling JIT improves real world performance more often than it makes it worse (and usually makes no difference): https://microsoftedge.github.io/edgevr/posts/Super-Duper-Secure-Mode/ https://microsoftedge.github.io/edgevr/posts/Super-Duper-Sec... Diabling JIT makes it possible to enable some additional exploit mitigation methods. A follow up article mentioned that few people who tried it noticed a difference: https://microsoftedge.github.io/edgevr/posts/Introducing-Enhanced-Security-for-Microsoft-Edge/ https://microsoftedge.github.io/edgevr/posts/Introducing-Enh... "It is worth mentioning that when we originally had this idea, we doubted our Microsoft Edge peers would even consider it. We quietly made changes to our browser without explicitly telling them the specifics and then asked them weeks later to see if they noticed the change. They would always say no, and only then would we inform them that we disabled the JIT. After surprising multiple developers in Microsoft Edge, we got the support needed to try this experiment. One can’t help but wonder what other well established assumptions about users and the web we should reconsider."