Actually I just thought of a reason those buttons would be useful. When the Garmin 1000 screen gets wet it stops responding to finger swipes, etc. Yeah, I know, a cycling computer that doesn't work if it's wet. FFS Garmin! Anyway, those buttons would mean I could stop it fucking my display up when I'm riding in the rain.
The shifter hood buttons are rather handy for that - it's like having the Garmin remote but without the orrible lump on the side of the shifters. The only problem IME is that it works fine for a few hours in the rain, then water gets into the Garmin if it's heavy rain, and it borks.
Depends which Garmin. My 1000 has had a couple of 'rain deaths' so I've filled the SD slot with silicone grease and tape it shut. It should be pretty solid now.
After its last rain death, mine has a screen with a slightly yellow tinge and the touchscreen works even less well than normal, which is saying something. It'll be going back for fixing when I find a reason not to just use an Elemnt instead.
The shifter hood buttons are rather handy for that - it's like having the Garmin remote but without the orrible lump on the side of the shifters. The only problem IME is that it works fine for a few hours in the rain, then water gets into the Garmin if it's heavy rain, and it borks.