I'm glad everyone can have it almost according to their preference. I say almost because let's face it, there's still some lame blemishes out there in the name of safety that truly nobody wants. But the idea of a handgun that cannot be disabled by a manual safety lever goes back to the beginning of the adoption of automatics by institutions and agencies that previously fielded revolvers that did not include safety manipulation in their manual of arms. Fairbairn and Sykes practiced and promoted the idea of pinning safeties on 1911's (and carrying them in condition 3). I don't think they were such advocates of condition 3 as they were, by experience, opponents of manual safeties. Needless to say, they and their practices were heavily influential in police and military doctrine, later especially in police agency doctrine and many people, departments, and institutions came to follow their thinking -- which I would emphasize was not merely opinion based on conjecture, but borne of experience and hard lessons. I have no argument against the idea that condition 1 carry merely requires training, but I also have no experience with failures of that practice whereas there are many people that do. Whether we think those people's bias against condition 1 is justified or not, they do have liberty to hold an opinion and maintain a practice different than ours, whatever it may be.
So we can see a practice that evolved of:
double-action revolver
single-action auto without safety in condition 3
da/sa with decocker and without safety
various striker actions without a manual safety
alternatively, we can see an evolution of:
single action revolver
single-action auto with safety in condition 1
da/sa with safety in condition 1
various striker actions with a manual safety
The question the OP seems to be asking is about the safety of "various striker actions without a manual safety." I believe the answer is they are made safe in carry either by having a DAO action where the trigger fully cocks the striker (I think these are mostly obsolete among duty guns), or by nothing more than a longer and possibly slightly heavier trigger pull that may complete the energizing of a partially cocked striker as well as clearing passive safeties, and a reliance on the holster to protect the trigger.