ZD,
Not for fear of it becoming gebrochts. That is something you made up and added because you wanted a reaction. And it is not just chasidim, many Brisker do the same as well.
The single item that are most likely to be ??? are the matzos. Therefore they limit eating to the mitzvah. This a chumrah they accept for themselves. They do not force on anyone else.
You should be particularly happy since they spend very little on matzos because of the chumra.