My understanding is the compost surrounding (but not used by) the root ball will stay too soggy for too long after it is wetted, and can become compacted over time as well. Soggy compost can encourage anaerobic bacteria and creates an unhealthy environment for roots. It would probably be different if you are planting into a very free draining gritty mix.
"What is hateful to you, do not do to your neighbour".
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