Stephen Tu, on 2018-February-13, 11:32, said:
Your scheme doesn't handle single suited minor well if 4c is Gerber as it would be for most intermediates.
4♣ by responder after 2NT by opener is still Gerber under this scheme.
The 4♣ bid I described is one of the replies by opener to the 3♠ enquiry by responder.
Stephen Tu, on 2018-February-13, 11:32, said:
You have a club slam try, then partner bids 4♦, now you are inconveniently high to both show clubs and get useful feedback from opener below 5♣.
This happens, although it is neither as likely nor as problematic as it might seem. You can see if your clubs are going to be useful anyway in diamonds (if you have a second fit) or in NT. If slam now looks unlikely now you can bid 4NT signoff. Otherwise you can cue-bid in diamonds which will tell you the Aces and Kings you need to know, then sign off in diamonds or NT (hopefully 6NT, which partner knows to leave well alone).
Like any simple and natural scheme it has limits, but it's easy to remember and copes reasonably well with this once in a month situation. For an intermediate partnership that plays mainly MP my feeling is that it makes more sense to save brain space for tricky problems that occur on a daily basis, such as defence against interference or bidding over preempts.