Noticing the left brakes (or right) wearing faster than the other side is a real clue, not a coincidence. Healthy brakes wear evenly side to side, so a lopsided pattern points to a fault on the fast-wearing corner. Here is what to look for.
A sticking caliper on that side
The leading cause of one side wearing faster is a caliper that does not fully release on that corner - a seized piston or frozen slide pins keeping the pad dragging; see sticking caliper symptoms and why one front brake wears faster. That side does more braking and wears out first, often with a hot wheel and a pull.
A collapsed brake hose
A deteriorated hose on the worn side can trap pressure so the caliper stays partly applied, or restrict release - see brake hose replacement. It mimics a sticking caliper and causes the same one-sided wear and sometimes a pull to one side.
Is left vs right meaningful?
Which side wears is mostly random - it just reflects which corner has the fault - though salt-belt corrosion and the crown of the road can slightly favor one side. What matters is the side-to-side DIFFERENCE, not left versus right specifically. Reading the wear pattern tells you whether it is the piston or the slides.
Fix before replacing pads
Do not just replace the worn pads - the fault repeats and eats the new ones. Free or replace the sticking caliper or hose on that side first, then fit fresh pads as an axle set with new hardware so both sides wear evenly again.