You can't progress as a civilization, or have peace and trust without a respect for reality - what the world is really like informs people and prevents tyrants and demagogues from pulling the wool over our eyes - a genuine love and wonder for the chance we have been given to study the mysteries of our existence is essential for healthy democracy.
Star Trek is sometimes inconsistent, but has an observable tendency anyway, toward respect for truth. This is why people are perhaps a little apprehensive about what might be pseudoscience appearing in Star Trek, not because they are unaware of fictional priorities - but because they might be disappointed if Star Trek contributed to obscurantist ideas about science, rather than public literacy. You can also do most things in sci-fi without violating natural laws too badly anyway, so I think many people appreciate the franchise when it tries.
No, Star Trek isn't an educational show, and has been treated as a profit making enterprise, first and foremost, for most of it's history. But would it have garnered the lasting respect if it hadn't tried, and had just been another "Lost in Space" full of magic?
The energy density of different fuels:
Antimatter (warp drive)
90,000,000,000 megajoules per kilogram - random antimatter
Nuclear fusion (impulse engines)
380,000,000 megajoules per kilogram - deuterium and helium 3
Nuclear fission
80,600,000 megajoules per kilogram - uranium
Chemical reactions
46 megajoules per kilogram - gasoline
37 megajoules per kilogram - fat
26 megajoules per kilogram - alcohol
25 megajoules per kilogram - coal
17 megajoules per kilogram - carbohydrates
16 megajoules per kilogram - protein
16 megajoules per kilogram - wood
Electrolysis
1.8 megajoules per kilogram - lithium battery
Obviously, carbohydrates such as sugar are the main fuel source of humans, plants, bacteria and fungi - if you burn a fungus you are mainly seeing energy from the carbohydrates in it's cells, as well as protein.
When someone says they can believe a fictional mineral like dilithium more than a fictional mushroom, they are being quite reasonable - they are just applying a High School level knowledge of energy density. So no, it's not reasonable to say magic stones and magic fungi are equivocal in terms of believability - it remains to be seen how these spores work, but some sort of quantum entanglement is about all I can think of.
Maybe the fungus will not be a big deal, or will be explained more, we shall see. But the idea it is right now just as believable as a mineral as a fuel source is not correct.