It is true that play value might be more important than aesthetics, still there is one big reason for me personally. And it is one aspect Hasbro doesn't seem to understand. The Beyblade anime was created to sell the actual beyblade tops/toys. And with Hasbro there is sometimes a big gap between what is shown in the anime and what is sold in stores.
If I see Nova Nepstrius change modes from attack to stamina, I would expect the toy to be able to do the same. If Wild Wyvron is able to lower the friction on the stadium floor due to its Orbit tip, I wouldn't expect Massive on the actual product. I wouldn't expect Roktavor to have a blue driver, Strike God Valtryek to not have locked wings and the regular Reboot, Twin Nemesis to have 2 instead of the 3 disc & Hit frame.
It might be just me, but if I have a character I like a lot in the anime, I would love to have exactly his beyblade that was shown to me before.
Other things have been mentioned already, general aesthetics that let good products (performance/durability) look like cheap fake toys etc.
Quality is a broad term. I'd say the bey's quality is really good, they just look extremely odd in some cases.