If someone was able to publish 30 papers prior to coming on faculty, he/she will probably continue this trajectory and publication rate. If the publications fall out considerably, then she/he was probably not the driving force behind the original publications. If someone does not continue on their trajectory the chair will need to carefully work with that faculty member to get her/him back on track.
Very true. Of course, this would take into account that for a trainee, before becoming faculty, increased publication rate and impact of the publications would, to some extent, reflect certain variables outside of his/her control such as:
(a) The political power of the supervising faculty (i.e., if you work under a hot-shot faculty member, it will be easier to publish in higher impact factor journals...now this is more of an issue in basic science).
(b) Increased network of collaborators connected to the supervising faculty member (i.e., ability to pool resources effectively and efficiently to get projects done faster)
(c) Funding already available to the supervising faculty member.
As a junior faculty member at a new institution, the above parameters are no longer a "given". Instead, he/she must establish one or more of the above which understandably takes time.
The main goal is to improve the health of the nation, not get promoted. If your projects are going to have substantial impact, then the information needs to be put into the published literature sooner.
In the grand scheme of things, you are right. Understandably, though, junior attendings are more stressed about keeping their jobs which, at some institutions, could be dependent on maintaining some quota of publications on a yearly basis in addition to providing good patient care on a daily basis. Keeping one's job allows one to put food on the table and to provide for one's family. And promotion is something that one may need to achieve to keep one's job (unless you are at an institution which allows you to retire as an assistant professor, for instance). Hence, to relieve a little bit of pressure, (and there is certainly enough pressure placed on junior attendings in academic medicine as it is), junior attendings may want to get the maximum "bang for the buck" when it comes down to publications.
That is why I presented my viewpoint which should not be taken as some heuristic to "game the system" but simply a different angle by which one could view the issue presented by the OP.
To the OP, I do not advocate holding back on writing your manuscripts until you are a junior attending. The risk with that is someone else with the same data as yourself may publish before you and "scoop" you. Look, every project goes through their natural progression from inception to publication anyway.
The impact of your work will be taken into consideration in addition to the total number. If you publish 3 or 4 papers, which become widely cited during a short time, this will carry substantial weight with promotions committees. Publishing your papers earlier allows more time for them to become cited. So there can be goal congruence, the health of the nation is improved and you get promoted.
Your point is well appreciated. This is a variable that people, including myself, likely do not take into significant consideration. Thanks for reminding me of this. The whole bit about the H-index is something I am now curious about and will check into.