It needn't be (and isn't) that way if you think ahead.
Just switch out the rims, re-use spokes. Bearings or even freehub refresh if needed and carry on.
I do all that for myself but for a customer is quicker and more cost effective to replace the whole thing than paying for the rebuilding, the rim, the freehub and the bearings.
@Netakure started
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It needn't be (and isn't) that way if you think ahead.
Just switch out the rims, re-use spokes. Bearings or even freehub refresh if needed and carry on.