We have been running Krypton test builds since Feb/March.
Great for people who are familiar with a command line but most of our users aren't.
As you are a regular Linux user, you should know how to troubleshoot small issues.
Kodi upgrades do not always go smoothly, but a reinstallation or downgrade is not necessary. We have covered potential scenarios on the blog and in the FAQ.
I recommend you disable updates, dd the card out, apply update and then you have something to revert if things do go wrong.
All that we can do is improve ability to revert updates in the future and try and make warnings of new, major upgrades more evident. It's theoretically we could detect incompatibilities in the future with new upgrades and advise accordingly.