What can I do about Spirits being the Omnihammer? Options

[ShadowDragon8685]

My players love Spirits. They LOVE Spirits. One of them is a Possession mage (had I been as wise then as I am now, I'd have said no, but c'est la vie,) the other is a Hermetic.

They prefer to use Spirits as the answer to everything. Need to fly a man eight hundred miles to infiltrate a ship? Have a Spirit of Air carry him. Need to bring something washed ashore on a beach in mid-CalFree to Seattle? Have a Spirit possess it, shapeshift into a crocodile, waddle out into the sea, shapeshift into a dolphin, swim it back.

I put the kibosh on that last one by telling them outright that that wouldn't yield the desired macguffin in usable form, thus making them actually do some Shadowrunning for a change, but their answer to everything is Spirits. It's starting to get to the point where spirits seem to be the Omnihammer, and the world, the Omninail.

What can I do/what factors in the world are involved to make that kind of shenanigan (long-distance Spirit couriering/spirit theft of things) unworkable as a solution to most problems of that nature, that don't royally fuck Adepts (like a background count will,) or everybody (like a majorly-twinked combat drone fleet will.)




As a side note, is a Possession Spirit inside something still Dual Natured - IE, can it be attacked by something on the Astral, such as another spirit or a magician?