It was common practice at some point, and keeps being taught, but it's no longer recommended even for IM by most medical associations (unless your injection site is considered high risk; but that pretty much is never the case for SubQ 4-6mm with 4-6mm needles).

I went down this rabbit hole after being handed a 100 pack of insulin needles and an estradiol vial with zero instruction - seemed irresponsible at first, but it turns out it's pretty hard to mess up.