Lou, you're missing my point.
Even assuming a pigtail or screw terminal, your splices are buried in the wall. Are you able to pull all the splices and both conductors out of a 3/8" hole easily or at all? Is the entire splice and split off point able to be pulled out for testing and metering purposes? If the answer is no, it's a bad practice. This has nothing to do with other trades and what may or may not happen, it's basic servicability 101. You need to be able to access all splices for field cabling and not bury them to make them inaccessable.
I've had to (unfortunately) do this more than a couple of times over the last 20 years....it's bad enough trying to pull 2 conductors and a splice on a pigtail out of a 3/8" hole, let alone 4 conductors and a splice. If you can't pull the splice out and jump a section through for troubleshooting or service, how can you eliminate what the actual issue is.
I'll point out some alarm system history and field experience.
Back in the day, many pros would use 2 conductor zippered cable, ie: lamp cord, in 22 AWG. As panels moved into solid state and loop voltages declined, in conjunction with EOLR's for supervision, a strange thing started happening...these systems that worked for 10-30 years started having issues. Installs that had security screens started having corrosion issues and high resistance faults. The culprit in part was the loop voltages and current started to decline when the panels changed. When you run higher loop voltages, splices and cabling runs "cleaner" and the faults either are blown out or don't happen (I've experienced this on takeover systems installing the M1, 7VDC loops vs. 3VDC on the prior panel). Less loop voltage and the cable, while not often, but with certain cable construction and types, I've seen firsthand the cable rot out or corrode from the inside out, and not at splice points, but under the intact insulation, located with a TDR. I also discovered, while not electrically significant when considering theory, where the EOLR is installed on a panel makes a specific difference, not just in the case of supervision and ground fault detection, but also to cable longevity. Had to bring a bunch of EE's from Silent Knight and Belden back in the day out to inspect a bunch of installs where cabling and sealed contacts were rotting out almost annually, but these systems were installed 20 years prior and everything ohmed out and noted on system inspections for 20 years before the swap. I say all of this because you need to be able to access the splice point from pigtail (from those style contacts) to field wiring and the splicing method (solder or crimps) to be able to troubleshoot and rule in/out causes of issues with wiring. While an extreme example, we had the zipcord leads on contacts rotting out at one point...how do you fix that if you can't pull out your slack and splice point?
As I've said before, if you're ok with the method you chose and are comfortable in not being able to access the splice point without destructive means, more power to you, but the professional way is to make sure every splice and joint from a pigtail to permanent cabling is accessable and can be serviced, If you can't access it, what's the point of leaving slack?