I dare say you answered your own question.
But yes in a world of updates then launch day stuff (possibly launch from the first region it dropped in if there is a month or two between them) tends to be the most hacked, or able to be made hackable if a specific update level is needed (it can be that the update introduces a new feature and with it an exploitable bug or part of the exploit chain -- picture viewers, web browsers and the like, though companies know this and will likely sandbox them heavily).
It is not exclusively so as plenty of later model devices have got superior hacks to the launch day varieties (see the xbox 360 in both DVD and JTAG/RGH).
This also fails to account for launch day problems -- they tend to be the worst cooled/hottest running, cheapest lasers (or worst quality control for them to get them out there and fix later) and a lot more things besides there. Some of this is accounted for in the most use and highest number out there (if there are 5 million out there all used for potentially thousands of hours then the 100000 sold in the last year and maybe only used for a few hundred by the most hardcore, which likely would have had an earlier model anyway, then you are going to get more failures in the former) but at the same time it has now been more than long enough to know that later stage PS3, 360 and Wii do far better than their YLOD, RROD and blinking/no dual layer reading prone respectively earlier varieties.
There are also upgrades (and downgrades) during lifetime. Now I am not sure what we will see here -- the 360 gained HDMI, 360 stopped sounding like a plane, hard drives for most things get bigger, PS3 lost linux, PS3 lost backwards compatibility, the gamecube lost fancy video out, SNES cheaped out, Wii lost GC ports... and the ps5 presumably comes with all the audio-video capability it might reasonably expect, leaving mostly the PS5+ in a few years with some shinier hardware to get a few games a speed boost that is vanishingly unlikely to be an exclusive game.
Also save editing has existed on the PC for decades. How many people make save editors these days for it is a different matter but the principle is there.