Yea, a valve stem tool is a "must carry".
Valve stems don't like dirt, sand, grit and water. If salt water, they can rust up quickly. Important to keep valve stem cap on tight. Keeps crud out.
I've been able to clean and restore a clogged valve stem. Having high pressure air helps a lot.
SLIME (anti flat product) will also clog up your valve stem, but SLIME is water soluble, so easy to clean up and get valve core working fine again.
Good idea to carry spare valve stems (I carry two) and carry a "real" valve core removal tool.

Note Valve core tool just above tube repair box. (at top of pic)
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