Don't you just hate it when you VNAV to the G/S Intercept, except, it just doesn't? So you have G/S armed and it misses by 3 inches and levels off. Now I'm the type who always just clicks off the autopilot and flies the airplane, but ....

A lot easier to correct a 20 foot deviation high than chase a G/S intercept from above after it goes several hundred feet high while you reset altitudes, punch a descent mode, dork with the power, add drag ...

My personal airplane has APP mode. Never use it.