5/7 of my bikes cross cables
it allows smoother housing curves around the head tube
especially important for us small people with narrow handlebars and controls all tucked in there

fun note, crossing even in places unexpected, like on a mtb toptube routing
or even having rear brake cable cross over (righhand front, lefthand rear)


if you want your LBS to redo it that's fine
but be polite about it,
since he hasn't done anything incorrect, it's just you making a personal preference request
- speaking from perspective of having been the mechanic