you're misunderstanding why people slide in baseball. at the bases past first it's often to make it harder to tag out. you give up an increment of time to reduce your tag-able surface. the most dramatic is at home some people almost wrap around the base because there is no penalty for skimming the plate then coming off.
at first, your concern is beating the ball rather than avoiding a tag. diving requires spring loading and a posture change which costs time. losing any time is not worth it in a race to the bag.
as someone who burst his knee bursa playing softball, there is also an injury risk in diving. if you don't practice it you may hit funky, or bounce, and that also slows you down.
when i slid on a cinder track i got some scrapes. when i slid on a rubber track i got some road rash.
you have to time a lean "just so" or you are awkwardly running bent over and slow yourself down. same story if you dove.