None of my EDC pieces have a manually operated internal lock so I don't have a dog in this fight. Personally I wouldn't recommend disabling any safety/lock feature in any carry gun. I'd simply carry something else.
I do have two range toys with internal locks, 625 & 986, zero issues, zero concerns.
Anything designed by man can fail. Apollo 13 ring a bell? Over the course of three decades I saw hundreds of men and women every year qualifying, training, and practicing with S&W revolvers. Although it was very rare, I saw S&W revolvers lock-up long before the internal lock was a gleam in the Clinton's eyes. The most common causes were the ammunition being used, reloaded ammo being the number one culprit there, and/or the operator.
Excerpts From:
The S&W Revolver Internal Lock
By Chris Baker
https://www.luckygunner.com/lounge/s...internal-lock/
"Despite all the damning evidence, the Smith & Wesson internal lock problem is likely not as bad as it appears. In truth, we only have anecdotal evidence that some S&W locks have malfunctioned. We have no real data that would indicate the prevalence of such problems. You can also find anecdotal evidence of exploding Glocks, slides flying off Berettas, and self-firing Remington 700s. Taken individually, none of these reports necessarily indicate any specific trend or “epidemic”. Guns are machines and all machines fail eventually. Some design weaknesses can make certain failures more likely, but it’s really tricky to determine just how likely."
"The reported problems often involve revolvers that have had custom work performed on them, or were pre-owned. It’s also a safe assumption that many broken lock claims have come from S&W owners who tinkered with their revolvers but chose to leave that fact out of their “report”."
"Many of the so-called “internal lock failures” can actually be attributed to
user error or some other problem not lock related. Of course, a broken gun is a broken gun, but not all supposed lock failures are genuinely what their owners initially assume they are."
Full Article:
The S&W Revolver Internal Lock
By Chris Baker
Follow Link then click on "Continue to LuckyGunner.com"
https://www.luckygunner.com/lounge/s...internal-lock/