Like I said, rate of fire is inaccurate as it's tied to animation. Do some testing with console commands, summon some ROF mods+full auto and the SP becomes a machine pistol. The stat can be made accurate but I consider it more effort than it's worth. Still, maybe the (innaccurate) stat the player sees on the pistol should be changed to an approximate number if it's saying it's faster than the SP, cause it's not.
If Pistol base accuracy is better this shouldn't be the case, it's an oversight and I'll update it.
Yeah pistol reload is better cause HDTP pistol has no reload loop unfortunately, so has to be 2 secs. Forgot about that.
SP also has better accurate range and max range, you left that out. Important for long range shooting which the default pistol is awful at after a certain range.
"So saying Silencer mods are limited when you have enough to modify every weapon possible is incorrect"
You have to get all three though, and as mentioned there's a big hefty price for one of them. If you take default pistol and want to silence all the three available weapons you have to cough up 2500 (or some lockipicks) that you wouldn't should you have took the SP.
"Even getting 2 out of 3 modded is quite good, for example the Sniper Rifle"
Silenced snipe? One of the most dominating weapons, and the best weapon to put a silencer on. You should have argued against the value of silenced assault gun, which is the least important of the three that can be silenced.
The capability of auto-fire for the Spistol sounds interesting, but wouldn't it make more sense to leave the pistol un-silenceable and give it the capability for auto-fire?
Leaving only two weapons that can be silenced? ...nah. And again, it's good that stealth pistol has > Damage Per Second, but Pistol greater base dam. Since damage output is the most important stat overall. Should the balance be imperfect, it's still better than vanilla balance where weapons produced very little noise anyway (a few feet on average) and it was close to an illusion that silencers meant something.