It is indeed a risk AND you must pin your current OS version, so no new update including no new feature (not sure which one one would need for now though) but more importantly no security updates.

That being said… if you do not actively try to mess it up, i.e. doing precisely what has been warned against NOT doing, it should be safe.

In doubt, if you can’t afford another headset, have no actual need for rooting and have never done that before, definitely safer to wait.