So complicated sia. Flash here flash there. I just use out of the box and updated to lastest build through the phone build in update.
What's the pro of custom rom?
Bricking risk high or not?
IMHO, there is always risks on whichever we do. Even updating via official method can brick the phone (although very rare).
Anyway, the guide I posted for edl mode is mainly for those whom still receive sets with modified rom or cn rom (which can be rare, but still reported by new users).
As long as you follow it well, then ok. However, if your IT skills is minimal, ya just stick with whatever you have.
Pro of customed rom can varies. Generally less buggy and consume less energy. Better ui in some. However some customed rom is junk. General rule, stick to those big player customed rom like xiaomi.eu, resurrect remix, lineage os, etc.
Your set, your choice. We don't owe anyone anything. Peace.