<p dir="ltr">Minhag, meaning it has some Halachic significance, must reflect an aspect of Halacha.</p>
<p dir="ltr">As Rav Hershel Schachter wrote in response to my pointing out to him that the Mishnah Berurah, Aruch HaShulchan and ShA HaRav all quote the MAvraham re soft Matza; to suggest we now are bound to a Minhag of eating hard Matza is like suggesting we are bound to have the Paroches a certain colour, which is plain stupid. The colour has naught to do with Halacha.</p>
<p dir="ltr">Yet some propose that a practice which even violates Halacha can somehow become Minhag and has some Halachic substance. Surely they jest.</p>
<p dir="ltr">It is most likely that sleeping in the Sukkah was dangerous or most uncomfortable. In order to persuade the uneducated masses to do what was Halachically correct, it was necessary to camouflage the apparently non Halachic activity as ultra-Halachic.</p>