I may have got this wrong, but I thought there was more risk from over-ruddering (slipping) then using aileron (cross controlling) as a (flawed)method in correcting the initial error. A skidding turn in comparatively safer.
I think I agreed with you, but not with the terminology. "Over-ruddering" (bottom rudder) is, I think, a skid not a slip. Think if it this way: use top rudder for a slip (ie crossed controls: stick one way, rudder the other). This is safe(r) in a turn to base. The danger comes from a skidding turn. At low height, there can be a psychological tendency to avoid bank, and use rudder not aileron.
Co-ordinated turn: good.
Excess top rudder (slip): OK if you are doing it (side slip) intentionally to lose height, and watching airspeed and attitude.
Excess bottom rudder (skid): bad.