Also 'I think' may be unique to Olympus system, the AEL can be coupled with different metering methods which I find very useful when shooting concerts
It is NOT unique to Olympus.
In Malaysia, there is a supporter of Olympus who claimed that "EVERYONE" copied several innovations (about 6) by Olympus.
If so, then Olympus would have taken action on copyright infringement. But there was not any.
By definition, Innovation is when one does something (convert an idea into reality) that was not possible before.
Wright brothers innovated a plane that was heavier-than-air, manned and powered, able to take off and land under its own power.
One cannot later claim that the Wright brothers innovation does not count as an innovation, because their 1903 plane was not as good as the other manufacturers' planes that followed years after that first flight. For example, Boeing cannot (and did not) claim to have "innovated" air planes because their B17 in the 1930's was better than the Wright brothers' plane. Thus claims that Olympus was the first to innovate Live View in a camera is wrong.
It is even worse when the absurd claim is that "EVERYONE' copies Olympus in these innovations.
In-body sensor based image stablisation (2 axis) was innovated by another company. Later Olympus picked up on this idea and made their own 5 axis IBIS.
Olympus cannot (and did not) claim to have innovated sensor based stabilisation.
In 1998 Sony already made a camera with built-in special picture effects in their Sony Mavica MVC FD81:
Monotone, Negative Art, Sepia, Solarization. It is obvious that such in-camera-body picture effects was NOT innovated by Olympus.
This was a camera that captured digital images onto a 3.5 inch floppy disk.
Olympus later took this idea and put art filters into their camera bodies.
Some one in Malaysia claimed that "EVERYONE" copied Olympus innovation of art filters.
As long ago as 1988, Konica made the Konica Genba Kantoku 28WB (Off Road series of film camera) and it was weather sealed.
Thus it is astounding that in 2019 some one dares to claim that "EVERYONE" copies Olympus in this particular innovation of weather sealing a camera.
In so far as weather sealing is concerned, it is a matter of degree. Rubber Gaskets and O-rings deteriorate over time. Heat and Humidity are the most difficult to deal with.
Afternote:
There was also a claim that "EVERYONE" copies Olympus in Computational Photography. Huh? How can this be?
The term "Computational Photography" was coined by Canadian inventor and engineer Steve Mann in 1995.
Marc Levoy is a professor of Stanford and he is a pioneer in Computational Photography. He gave a talk at SIGGRAPH 2007 (total 19 papers) on New Techniques in Computational Photography. That was even before MFT was announced by Olympus and Panasonic in August 2008.
Other notable researchers in Computational Photography were Shree K. Nayar, Ramesh Raskar and Jack Tumblin.
Dr. Ren Ng founded Lytro, Inc. in 2006. Lytro sold a pocket-sized camera, capable of
refocusing images after being taken, on 29 Feb 2012.
Olympus did not (and dares not) claim to be the innovator of Computational Photography.
Someone else made this nonsensical claim on behalf of Olympus and worse - accused "EVERYONE" of copying Olympus in computational photography.