I agree with more careful approach to major updates. The main problem is that the Turris team supports only configuration changes done through Web UI (Foris or LuCI), which, although understandable from the maintenance costs and sourcing perspectives, ignore many community power users who configure the router on command line.
In my case, I lost LXC services and was able to fix that quickly (details at Upgrade from 3.x to 5.2.3 and LXC problems), but the problem is that potentially problematic upgrade was rolled out automatically without me being able to account for that.
I would strongly prefer to be able to opt-out of automatic major version upgrades so I can plan for them and upgrade only when I’m ready to spend time on potential fixes.
However, complaints aside, thanks the Turris team for all the work! 