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Sounds like you may have not had much experience with a fully insulated colourbond shed or observatory.
Sure there are advantages to building off the ground with a wooden floor same as there are opposing advantages to building on slab. Similarly with disadvantages of both.
Regarding wall insulation it works...it reduces heat radiating into the internal space in the first place. It may help retain some heat which is helpful in colder conditions but this is easily controlled.
And a solar exhaust vent can be put on a colourbond shed just as easily as any other shed.
But I can bet my shed is much stronger and will last much longer in the same conditions ;-)
Also one objective of any structure containing sensitive equipment is to minimise overall continuous environmental fluctuations........less materials wear and degradation.
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