Time to prune Photinia / Fatsia Japonica?

in Plants
I'm thinking this weekend to get out and cut some leggy branches down on my Fatsia Japonica.
Also to even up an actively growing Photinia Red Robin which is producing flushes of new growth.
Both were down as Spring pruning jobs, but while the Fatsia feels right, the Red Robin growth is literally happening right now and cutting some of that back feels very odd with the new growth in it's infancy. Why is that suggested as something to do in Spring?
Also to even up an actively growing Photinia Red Robin which is producing flushes of new growth.
Both were down as Spring pruning jobs, but while the Fatsia feels right, the Red Robin growth is literally happening right now and cutting some of that back feels very odd with the new growth in it's infancy. Why is that suggested as something to do in Spring?
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Sorry if it's a silly question!