If they are iffy players they'll use 4 memorised sequences then enter the mid-game with a losing position. Playing out memorised sequences without considering the interactions the corners have on each other is one of the weights keeping amateurs from moving up to higher ranks.
If you are playing someone who is worse at fighting then playing good-enough joseki and making up any theoretical difference in the middle game is a fine strategy. But even choosing good-enough joseki requires thought (or instinct) that does beyond what can reasonably be called memorising. It is critical to recognise when a framework is getting too big and invade before the opportune moment passes.
As thomasahle notes, pretty much every game is unique and a memorised sequence unbacked by an algorithm cannot hope to be optimal.
If you are playing someone who is worse at fighting then playing good-enough joseki and making up any theoretical difference in the middle game is a fine strategy. But even choosing good-enough joseki requires thought (or instinct) that does beyond what can reasonably be called memorising. It is critical to recognise when a framework is getting too big and invade before the opportune moment passes.
As thomasahle notes, pretty much every game is unique and a memorised sequence unbacked by an algorithm cannot hope to be optimal.