RoughRomanMemes

But for the regular farmer, did the Rexit bring disaster?

Yes, actually! This used to be a more debated point, with a strong (if still minority) view arguing for material stagnation (or even improvement) rather than decline after the fall of the Western Roman Empire, but since the 80s that's been largely quieted by archeological data. Even taking just the transition from the immensely degraded Late Empire (4th-5th century AD), and not the more-prosperous-and-functional Principate (1st-3rd century AD), there was a massive and sustained decrease in living standards.

As the above comment mentions, even things as basic as pottery were set back - imagine going from owning iron and bronze cookware (valuable, of course!) and eating off of terracotta plates, to having one clay pot for cooking. And you can't heat it too much, or it'll crack. And the pot leaks if the soup is left in too long, because the only place still making non-porous pottery is halfway across (what-used-to-be) the province and doing so with much reduced supply and demand, no other supply sources/competitors, increased prices, and the ever-lingering uncertainty of the existence of a stable market in your little corner of, say, Spain.

This works for everything from tools to building materials to architectural design to furniture to hunting equipment. Not even getting into questions of abstracts, like road maintenance, security, or the luxuries market.