The M&P series, Glock's and Sig P320 are all designated as Double-Action-Only fire control mechanisms.
The striker is cocked 95-98% when the slide is in full battery.
I can't speak to the SIG and S&W, but Glocks are not "95-98%" cocked when in battery with the trigger released. Judging by trigger pull, I'd also say the same about the FN 509. That's part of the overall Glock safety concept and has been since the very beginning - even if the striker somehow slips off off the cruciform and the firing pin safety is defective, the gun still can't go off without a full press of the trigger because there isn't enough energy stored in the firing pin spring at rest.