R v Miller was important but ultimately overtaken by events - while Parliament did want to discuss Brexit, they were unable to find a viable solution and we still got no-deal Brexit where vital things like the status of Northern Ireland had to be patched up later. For whatever insane reason, the demand to eject us from the Single Market was just too strong.
R (Miller) v The Prime Minister (not to be confused with R v Miller, or R (Miller) v Secretary of State for Exiting the European Union (the solution here is clearly to just stop naming people 'Miller', to avoid further confusion)) was probably ultimately more important in its precedent than its concrete outcomes, though, yeah.
