An aeros course is the best way of improving handling skills and confidence in as short a time as possible. Tens hours of aeros is worth fifty hours of straight and level bimbling...
agree completely... and it's fun too
...and I wish it was made mandatory after licence issue.
Can see where you're coming from, but equally should you have a PPL when you can kill yourself by flying into IMC? kill yourself by carrying on flying after sunset? When you cannot use a GPS? None of those are sufficiently well taught at PPL level.
At some point you've got to let the pilot get on with it. What i'd like to see is encouragement to do a few hours of instrument training and some unusual attitude training post-PPL, so even if you don't go on and do an IMC or aeros you can get yourself out of situations that your aeroplane can get itself into (with or without your help).
Greater availability of experienced instructors and suitable aeroplanes for aeros would help too (just because it can be spun doesn't mean that it is ideal, e.g. the PA28-140). They can be found, but a lot of Piper/Cessna type schools just aren't geared up for this sort of thing.