The smart thing and 'what won it' was Boris simplifying Brexit. Making out that it is just one thing. The truth is, Brexit is a collection of many boring but highly important things - from the irish border and ensuring peace, the unity of the UK, peoples future travel arrangements and freedom, Uk citizens rights in the EU, trade agreements and the Uk economy, and the UKs regulatory legal setup, the EU exit agreement, a future trade agreement with our biggest trading partners and a whole heap of other very boring stuff. But all massively important to the UK. Most of the above is not nearly "done". Only the withdrawal agreement is.
Blocking "it" is a misunderstanding because Brexit is not one thing. Brexit is a collection of dull, but vital ongoing flimflam that will run and run. It will shape the UKs future position in the world so it needs all sorts of time, care, money and patience. Boris pretended it was wrapped up - sorted - that was a lie but also genius.