I think Shield dropping can be succesfully applied in situations you should light shield and in situations where regular shield is appropriate. So the real question is when you should light shield on platform vs full shield. Of course, because shield dropping is your fastest way to get aerials OoS, being able to shield drop makes your full shield more useful.
If you want to shield an attack and retaliate afterwards, then you have to either full shield, or get pushed off a ledge, because light shield makes you take too much shield stun to be able to retaliate in most situations. However, full shield with many chars is often almost useless on a platform if it isn't near full health, since it's usually too easy to poke. Of course you can angle your shield but that makes shield dropping much harder. I've been actually practicing dropping out of a down angled shield to punish marths trying to hit my shield from under me. As a summary, I prefer using full shield if it covers well enough, and switch to light shield when the shield has worn a bit. Also light shielding near ledge is good vs chars that don't have multihit aerials or other moves to deal with it.
As for shield dropping as movement method, for example if you want to drop through a platform during dash, it ofc doesn't matter which type of shield you use.