What is the mekor for hbad people to daven shm’essrei shaharit on shabbat afternoon . Why are they not brahot levatala
One source is today’s rambam hilchos tefillah see the ראבד
See also צמח צדק הלכות ציצית about if women can make a bracha on a mitzvah they are not obligated (it’s a long teshuvah and talks about making brachos if one is not obligated)
Many more sources and it’s not only chabad, look in piskai tshuvos,
One of the reasons for davening late is because by davening a person needs to have kavanah he is standing before hashem and talking to him (reb chaim brisker writes that if not, it’s not davening at all) that’s why in shulchan aruch it says you need to forget about everything before you daven, and many other hachanos stated there.
Who says one should skip all the hachanos, and just say words with minimal kavanah in order to beet chatzos? It can be not even considered davening.
It actually says in shulchan aruch if one can’t have kavanah he should not daven