Probably more a PITA to try to get the tape under the housing at the end of the bar than to just tape over it ..

after 30 years of using them, I tape the shift housing down up to the band around the bar that holds on the brake lever..

I have to stop wrapping there anyhow and then restart above the lever, ..
the housing is routed to clear the handle bar bag as it passes from bar to frame stop.

Others just tape the housing down for the straight parts until the bar bends upward.

using high quality Die slicked cables lowers the internal friction in teflon lined housing ..

you cover the bit of tape ,you use to hold down the end of bar tape when you first wrap the tape around once..