Because we want to go forward not back. You just admitted Cucu is better Why would we want to go back to 2 years ago? When Solly was being used as wingback all aeverybody went on about was our need for a LWB
Well some times Brighton are not going to have a world class left back despite there being one once. It is just how it is. Money can be spent to strengthen the team overall, or you do it low-budget, but we can not expect that any position will always improve. If Cucurella leaves, Brighton will probably be weaker at left back next season - but hopefully overall there's improvement or similar level, one way or another.