For almost a century folks turned bikes upside down to work on them. The handlebar and seat made a perfect tripod.
Drop bars broke most of the habit because doing so damaged the brake cables where they left the lever. In the sixties and seventies, Cable housings folded at the top of the lever were about as common as white bread.
Nowadays, with aero brake levers, there's no longer a reason not to flip a bike over when working in the field. It's not my cup of tea, but there's no problem either.
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