My living room is 70 feet long and almost 40 feet wide at the widest point. (Yes, I realize this is a lot of space.) In the ceiling there are 50 can-style light fixtures, each of which currently has a BR-30 LED bulb. These are controlled by about 25 light switches, scattered widely around the room, each of which operates one or more cans. In case it's relevant, nothing is dimmable. I do not currently use Alexa or any other sort of smart-home system.
I would like to be able to flip one switch and have all the lights come on, while retaining the option to turn on lights selectively. My main goal is to be able to light up the entire room as soon as I walk in the door.
I know of three ways to do this:
A. Replace the fixtures with smart fixtures.
B. Replace the bulbs with smart bulbs.
C. Replace the switches with smart switches.
I realize that options A and B will also allow me to make things dimmable and allow for color adjustment. Those things would be nice, but don't feel mandatory.
I believe that C is the cheapest option, using, e.g. the hardware here. (See demonstration here.) My understanding is that after installing this hardware behind all of the switches, I will be able to turn on all the lights from my phone (or better yet from an iPad mounted on the wall), whereupon the individual switches will operate as toggles, so that I can turn off those lights I don't want. This sounds about perfect to me.
Are there other options I should consider?
Do any of these options have pros and/or cons I might not be thinking of?
Are there better smart-switch options than the one I linked to?
Based on others' experience, am I likely to be making a mistake if I choose C, thereby forgoing both the dimmability and the color control?