The big advantage of it is that it is not ubiquitous - do you really mean that or do you mean universal? - which means that when someone plays Puppet or 5-card Stayman as we do, we alert. In the ACBL we should not do anything and when players assume 1N - 2C ...
Thanks for the answers. The basic problem here is that 3N was cold but only played from this hand. Partner held
9xx
Ax
A9xxx
Axx
If you pass you may reach it since partner may decide to bid again. If he doubles perhaps you can bid 3N presuming partner will ...
An announcement for Stayman is useful and distinguishes from special Stayman responses, unlike the ACBL where the rule for a 2♣ response to 1N is definitely not ‘useful’. Since it was previously alerted this is an improvement and English/Welsh/Northern Irish players are happy with it. In the ...
This is Acol with light 2/1s. 1♥ - 2♣ - 2N = 15+, so with 13-14 4=4=3=2 1♦ is opened.
This 15 count looks a bit good to be treated as a balanced 13-14.
It is unfortunate that people confuse the terms ‘call’ and ‘bid’ just as people confuse ‘evidence’ and ‘proof’ and many other well defined terms.
A bid is a number of tricks followed by a denomination so pass is not a bid, as Jim says.
Is it alertable? It depends on the jurisdiction, ie where it is. I see some responses have assumed ACBL but not everyone on BW is in the ACBL.
It is certainly alertable throughout the British Isles and in the ACBL.