I dont do a lot of maintenance these days but I always wonder why tf use this or that niche bolt head like Torx or flat head when theres no angle to reach it or some aircraft bolt heads like T20 is so small there always being stripped. Hey let's put a hex head that is facing the earth in a tight panel surrounded by exposed wires and electrical posts such that you cant use a hex socket and need to use the L shaped Hex tool and so can only turn it 1/20th a turn before removing and repositioning ahhhhh