what was wrong with struct & class in C++?

[BC]

I thought it was a great idea to allow both value semantics
and pointer semantics for the same types in C++ by the simple
addition of a * or &. What was wrong with that that needed
to be fixed in D? GC could have been done without changing
this. Now in D template code doesn't know which
semantics apply and structs can't inherit. If you write
something as a struct and then realise you need inheritance
you're stuck. D has so many good ideas it's a shame to see
it broken in this way...