Interesting Dispel Magic Questions

[RSP]

Generally speaking though, you don't need spells to direct creatures.

What? You’re saying PCs get to command animals, fey, elementals, etc., that they encounter? That those creatures will just automatically obey their commands?

The plain reading of shadowblade, is that it creates a weapon that lasts until the spell ends, or you throw or otherwise let go of it. While the spell is active after the weapon has vanished you can create a new one.

You’re not creating a new one, that’s not a plain reading of SB, that’s you making stuff up. It’s a single created weapon that has a different form. And nothing says it vanishes.

I could see someone dispelling just the shadowblade when targeting the blade (spell would end, but the caster would not lose any other effects like being frightened or blessed). But I don't see it being a valid target while disapated (even with RSPs reading, I am not clear what properties the blade is supposed to have while disapated, as far as I can tell the argument would mean it is still useable as a weapon while disapated - since it is still a weapon with the described properties by that reading). It disappear and reapears when the caster chooses to bring it back into existence.

It feels to me like its the caster focusing a magical effect into a shape and sustaining it with an active spell. And so dispel targeting the caster should be able to end the effect.

Most effects like this generally don't disapear and reapear depending if the caster is actively controlling them.

This makes it seem more like darkvision, the spell gives you an additional capacity that can affect other creatures.

Again, very similar to magic on the caster allowing them to command animals, fey, elementals, etc., they created. You’re just (rather arbitrarily it seems) deciding one is on the caster and one isn’t. There’s no reason a magic weapon can’t have magical properties (theres already plenty in the DMG).

There is no already existing ability to command monsters; that’s 100% part of the spell that summons/conjures them.

RSP, I assume you’re not a robot.
So you should be capable of reading and coming to a reasonable conclusion about what the designers meant.

For Shadow Blade, as an example, it can be thrown effectively. But it cannot be used by anyone besides the caster.

Yup. I can. But poorly written rules are still poorly written rules: I’m not sure why you’re against pointing them out.

And I’m a lot less concerned about them then I am curious about DM and its interactions.

By all means, though, if you believe handing something to someone is common English for “dropping it”, continue to do so. I don’t think it is.