DIY Drone capabilities

Just wondering, are DIY drones capable (within reason) of beign built to do everything that a DJI drone can do? Specifically, I am wondering about tracking, obstacle avoidance sensors, etc.

I am looking at either going the DJI Mini 3 Pro or building one from a qav500 v2 frame. I really like the idea of building my own, especially the capability of repairing damage, but I do not want to sacrifice capability.

Thanks and sorry if this has been asked before.

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