Photoshop is different - since ps is neither able to work linear nor respect gamma of alphas or able to do predivision you're lost anyways, no matter which format you're using...
A big plus for Deadclown to plow through this bro-science :- )
I don't even have energy anymore to explain the difference of linear files...
But regarding Photoshop
not working linearly or respect gamma, I would want to say that's also incorrect. While the options for working linearly in PS are still limited, it's more than enough for basic compositing and color correction.
PS opens linear files like .exr completely fines, switches to 32bit/Linear mode and the layer modes work in linear math (those that can). What do you find problematic ?
Since CC was introduced, there were great improvements in this regards, like layers, alphas,etc.. It's not perfect, but it works.