Every situation is different.
At 70years+, EU citizen, with serious health problem, of course it's the EASY choice to go back in UE (Spain, France etc..) to get 'almost' free healthcare and all facilities.
Opposite side, if you are a EU 'young' and wealthy, there is no point to go back in Europe in France/Spain with crazy high tax, aggressive tax office, and at the end not that safe.
All is different for each situation.
Take care.