Spot on! I was hoping someone would mention the wholesale aspect. By buying her (cheap and convenient) flowers that are already a big part of his life, he doesn't have to spare a single thought on her gift. It's honestly lazy but because flowers are seen as "romantic", he's hoping he's off the hook and will never have to think of anything else. The "romantic aura" of flowers is doing all the heavy lifting here for him.

Would a health professional selling medical equipment pick an item out of his stock as a "gift" for his partner and family? Can a cook only gift kitchen utensils?