I understand the sentiment, but I don't get how you could draw more complex software plans by hand. I usually use Draw.io/Diagrams.net, and the drawings get pretty large and need reorganizing dozens of boxes several times while planning the architecture.
OTOH if the plan is very simple and obvious, and can be drawn out in one go, it doesn't really need a diagram in the first place, so I skip spending time drawing the obvious stuff.
OTOH if the plan is very simple and obvious, and can be drawn out in one go, it doesn't really need a diagram in the first place, so I skip spending time drawing the obvious stuff.