Why not?
Topping doesn't cause significant damage to the plant because all you're doing is removing a small amount of growth from the plant that has contributed almost nothing to the plant in terms of photosynthesis. Sure, there's a wound but the plant reacts to that immediately and that process is well on its way in a day or two.
That's the inverse when growers remove lower fan leaves in flower. Plants use the chemicals in fan leaves for growth and for loading up seeds with nutrients. Despite that, growers gleefully cut off those nutrient stores.
All in all, topping is a valid method of removing the apical stem to control plant shape.
"incredibly tight" - I top my plants and since I grow under separate veg and flower lights, when I go to top at day 21, it's difficult to get to the fourth node. The plant in the attachment is 21 days old, about 5" tall, and it was actually five nodes tall.
(Yeh, got a little nute burn. First time I've grown a photo and their Chemdogs that have been in the 'fridge for 18 months so I'm thinking that they're a little touchy about nutes)
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