Playing a half step, 1-3, in the lower positions is not something I was ever taught. It really comes in handy, though, and helps develop the strength of the 3rd finger. Basically, I never use it when playing 3 notes in a position. That's always 1-2-4. But if I am just playing a half step before shifting, I offers use 1-3. Especially if it is a trill or a goose egg. Playing 1-3 helps keep the hand compact, strong and reduces tension in the hand.
It's another tool in the toolbox.
p.s. one fingering that I like a lot is when playing a half step, followed by a shift up the same string to another two half step notes. for example: E-F-G-Ab or E-F-G#-A up the D string. Fingering it 1-3-2-4. It keeps the hand compact and powerful and eliminates the gliss if you finger it 1-2-2-4 and is a shorter distance than a fingering of 2-4-2-4 or 1-2-1-2.