I had a Nikon 85 1.4 AF-D lens with wonderful big spun aluminum hood.
This has been the only lens with screw in hood for the time until I sold it.
I hated this lens hood, as every time, I decided, to go small with naked lens and small body, I had to screw around!
What I think, is a real shame for a German engineer at Leica is, that Nikon and basically any other lens manufacturer of affordable mass produced lenses can design convenient, efficient lens hoods, that let you fit the hood, a lens cap without screwing around with the hood and often even have a solution for saving space for storage.
Leica lens hoods are a mess - there are way too many different designs, one has to carry either the hood or a separate lens cap and every generation, the manufacturer changes the hod design, which strongly reflects, how insufficient the technical solution of these are.
The best solution with the most ingenuity by far are the sliding hoods - be it with or without lock - as these are clean, always there for convenience, cannot be lost and lens caps (only one) can be fitted on the lens, with the hood collapsing for storage.
On top, the lenses, which have these slide hoods are very well corrected for flare, making the "less efficient hood" as many argue a possible solution.
Even better - people, who feel, the slide hood is not sufficiently to their standards can fit an aftermarket hood as they please without looking ridiculous.
I don't understand, why Leica does not go straight with this beautiful design along with all lenses, down to the real wide angles (28 and shorter), where the rectangular hoods make a lot of sense.
[end of Leica hood rant ;-)]