Yeah true, i have been doing a similar solution with Kontakt for the last few years.
Limitations are that every time you work with a new kick you need to go in and adjust the attack/tail part on both tracks.
Can be a lot of fiddling around back and forth sometimes to find the right point.
If its just one thing then its easy to just drag back and forth and listen, but having to go to both channels and adjust means doing quick tests is impossible.
Thought it would be cool to just have a simple solution built in, been doing workarounds for years now XD, hoping for a solid one click solution one day 