[Tagging] Should greenhouse et al have building=yes? (was building=digester)

[Andy Townsend]

Can I ask a silly question at this stage - taking something like a 
greenhouse, would someone ever treat it differently depending on whether 
it has a building tag or not?

In my case when trying to figure out how to render things like this the 
answer was "no":

https://github.com/SomeoneElseOSM/SomeoneElse-style/blob/master/style.lua#L608

but in some cases a building tag was used as a cue for some other rendering:

https://github.com/SomeoneElseOSM/SomeoneElse-style/blob/master/style.lua#L1502

If a greenhouse is a greenhouse, regardless of whether or not it has a 
building tag in OSM, surely it doesn't matter whether or not it is 
tagged building=yes?

Cheers,

Andy