I took the bait and bought Team Xecuter's dongle. I don't care about online on the Switch at all so we'll see how it goes.
The tool is a complete scam. Here's why:
1.) Its purely designed for piracy.
2.) Its designed to run in sysNAND (so it is not a CFW, it is just a hijack layer on the firmware).
3.) It depends on you updating the firmware to maintain software/firmware compatibility for the system, because the 'OS' does not actually do any sort of bypassing or updating of anything itself. Games made on higher firmware will break on lower firmware just out of software compatibility evolution.
4.) Because it depends on Nintendo's firmware distributions, you are forced to have compromised sysNAND talk to and effectively send out compromising logs to Nintendo's servers. If the dauth token is revoked, they could also revoke firmware update access.
5.) It will need routine updates that you cannot push yourself because it is DRMed software (see: brickway), and every firmware update has a high possibility of breaking the hijack exploit chain even with a boot-level exploit. Forcing you keep waiting on updates for a DRMed pile of garbage.
5.) If you get banned from dauth tokens and the update server, the tool is now useless.
If you want to use it as a payload package, you can make one for much less and not be stuck with a DRMed OS nor supporting a piracy group that tried to profit off of a zero-day exploit in a common chipset.
Firmware below 5.X will allow coldboot (Booting into CFW without using rcm/jig). It's possible coldboot will come later for other firmwares but it unknown at this point.
The current compatibility problems are due to certain APIs and system features being only compatible on certain firmwares. Being on 3.X or 4.X etc. won't be a problem when you are emulating a nand of a higher firmware.
Basically:
4.X or lower advantages:
Coldboot soon
4.x isn't getting coldboot. Nothing but 1.0 is getting actual coldboot, 4.x will eventually get user-input boot execution from software without the need for a dongle but it will not be a straight coldboot.
4.x isn't getting this any time soon at all. All exploits past 3.x are being kept private until Mariko hits because they're our best/only hopes for bypassing Nintendo's secure kernel. There will not be a hardware level exploit on it, we've already burned that thanks to TX (wasting the most valuable exploit for a hardware ever).