A spinoff of #486 but with a whole different point centered around machine hull upgrades.
(sorry for spaming the issue tracker, got into a bit of a brainstorm)

Right now machine hull upgrades in singleblock machines only change the input voltage.
In multiblocks a higher hull fluid and item input has double the storage.
This could be the case for single block machine hull upgrades, for fluids especially but
for items as well. Some machines benefitting greatly from more input slots.
(A macerator hooked up to a quarry could work on one resource without interruption longer for example).
As I already mentioned in #486 hull upgrades could also double the baseclock of the machine.
It would make sense for an advanced machine to spin up faster than a low-tier one.
(Not to mention that as a byproduct it would fix #486 and also add better compatibility, as mentioned there)

#486 is not happening in any way.

You can use configurable chests and configurable tanks as buffers if you need more capacity in some machines.