Personally, I have the exact opposite opinion on optical viewfinders. Optical is eyestraining, non-ergonomic, physically limiting (can't use an optical viewfinder when you're shooting at foot or waist level without contorting yourself into weird positions), and modern shooting modes often require a lot more setup and selection than is comfortable to use without a full-size screen and looking at the controls you're hitting.
That last point depends strongly on the camera. I almost never have to take my D500 away from my face when I'm setting up a shot, because it has physical controls for the exposure parameters and displays in the viewfinder to show changes of setting - not just shutter speed, aperture, and ISO, but even down to stuff like bracketing and flash exposure compensation. Granted, a lot of DSLRs, especially the prosumer ones, don't benefit from such thoughtful (and expensive!) design. But you absolutely can get cameras that are ergonomic to operate.
(Well, if you buy Nikon, anyway. I don't know who does Canon's UI design, but whoever they are, they could be a lot better at it...)
You can buy a 90 degree viewfinder adapter if you really want to shoot low down. They're not very expensive.
Optical viewfinders also vary quite a bit in size which impact eye strain quite a bit - unsurprisingly the larger, brighter ones are typically in the more expensive cameras. If you ever get the chance, try a top of the range DSLR viewfinder next to a bottom of the range one. You might be surprised at the difference.
You can't use an EVF at foot or waist level either. That's not what I am on about. I have no issue with using the large back display, articulating or not, as a live display when needed. But when I want to use a viewfinder I want it to be optics, not a tiny screen in a tube simulating that view. And like @throwanem said having tactile buttons/dials available as no look controls is a thing a lot of people like to use over touch screens. I understand it's a personal preference and an increasingly minority opinion.
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Personally, I have the exact opposite opinion on optical viewfinders. Optical is eyestraining, non-ergonomic, physically limiting (can't use an optical viewfinder when you're shooting at foot or waist level without contorting yourself into weird positions), and modern shooting modes often require a lot more setup and selection than is comfortable to use without a full-size screen and looking at the controls you're hitting.
That last point depends strongly on the camera. I almost never have to take my D500 away from my face when I'm setting up a shot, because it has physical controls for the exposure parameters and displays in the viewfinder to show changes of setting - not just shutter speed, aperture, and ISO, but even down to stuff like bracketing and flash exposure compensation. Granted, a lot of DSLRs, especially the prosumer ones, don't benefit from such thoughtful (and expensive!) design. But you absolutely can get cameras that are ergonomic to operate.
(Well, if you buy Nikon, anyway. I don't know who does Canon's UI design, but whoever they are, they could be a lot better at it...)
You can buy a 90 degree viewfinder adapter if you really want to shoot low down. They're not very expensive.
Optical viewfinders also vary quite a bit in size which impact eye strain quite a bit - unsurprisingly the larger, brighter ones are typically in the more expensive cameras. If you ever get the chance, try a top of the range DSLR viewfinder next to a bottom of the range one. You might be surprised at the difference.
You can't use an EVF at foot or waist level either. That's not what I am on about. I have no issue with using the large back display, articulating or not, as a live display when needed. But when I want to use a viewfinder I want it to be optics, not a tiny screen in a tube simulating that view. And like @throwanem said having tactile buttons/dials available as no look controls is a thing a lot of people like to use over touch screens. I understand it's a personal preference and an increasingly minority opinion.