and the gruesome thing to know: even a pruned node does an IBD in full (you may test this with a Start9), takes now two weeks, depending on ...
And you can even see (if following in details), where the alien to bitcoin materials drop in.
Yes, we could assume, that the technical improvements (kind of Moore's law ) outdo these attempts, but still, its a burden the chain should not have to take on. If easy to forestall, let's do it!