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For sure these things in the OP are not good and aren't suitable for many typical installation scenarios. But if we are talking about plug/socket connectors too then there are hundreds of claimants for the title, either because they are impossible to work with, dangerous, fragile or unreliable.
From a safety point of view in 2023, there are a couple of power types from the early to mid 1900s that are almost unbelievable now if you are not already familiar and comfortable with them. A system where you can insert your fingers - half of your hand even - straight into the live socket contacts, and the plug has its screw terminals on the outside, probably sounds like a practical joke; but it was a real thing and I have used them.
If anybody cares to listen to my rants about the fiddly ones I will happily rant.
More details of those please Lucien!
I'd also nominate high density DIN connectors. The circular type. Nightmare to get a soldering iron to some of the centre contacts, even with a fine tip.