SMB is absolutely ideal for management on the same server. The interface (Explorer) every one already knows exactly how to use it, and the speed is identical to using Krusader / MC directly on the server (eg: for copying / moving files within the same server, the data never actually traverses the network, so you can quite easily hit the speeds of the drives and exceed the network line speed -> eg: copy files between my nvme's I can easily hit 700MB/s (7000 mbps) on a 1 gbps network.
Moving between servers however, stuff will get routed through the 3rd party which does have some overhead.