Dude, the $2k solution is not only worse than postiz they charge an additional thousand for each channel.
It's just garbage software, I brought it up as an example IDK why. Commentators here like knowing snippets about other industries in the profession, I know I do at least.
But to answer your Q, yes I do expect a cron job schedule, analytics, and a CRM not to require 8 gig of ram in order to not barf on itself too hard.
These things are incredibly resource intensive for their actual jobs. The software is incredibly wasteful.
A $5/vps should be enough to host every suite of software a small business needs. To think otherwise is extremely out of touch. We're talking about 3 concurrent users max here, software should not be buckling under such a light load.