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'drone', 'drones'

'vehicle', 'vehicles'

are counted as separate terms. Joining them would make more sense to me.

It's almost like they'd never heard of a Porter Stemmer.

A porter stemmer has disadvantages too as it would combine 'training' and 'trains' (freight).

Maybe you just need something that trains your porter stemmer to avoid such mistakes.

guys, I just had a great machine-learning startup idea...

Because of this ambiguity, they could easily configure the stemmer to only de-pluralize instead.

That was an odd oversight and would put drones at #3.