I've been trying out a rolling-release, Debian-derived system, and this is a nice feature, I must say.

In Knoppix's defense, it might be noted that Klaus K rather regularly updates Knoppix annually.
KK's distro, if I may use that term, is more up-to-date in concepts and kernel number than many linuxes.

LiveUSBs are pretty inexpensive these days, you can have more than one linux if you want.