Let us all be quite clear here. No one is advocating no hand flying, no one says that one day you won't need it if the automatics fail, (despite massive system redundancy on most modern aircraft), no one says that practise isn't necessary, in fact whether or not one should maintain hand flying practise is a question that, despite not having been raised, is getting plenty of answers here!
The question is whether or not the PF should dump the automatics in a busy TMA to hand fly and thus load up his PNF and thereby reduce safety margins and that is all.
Whether or not one asks/discusses with/tells the PNF that one is about to disconnect the automatics depends on the level of CRM in that company and just how sloppy or otherwise their flight deck procedures are.