So far I've found the 15 inch MacBook Pro 2017 to be tougher on the eyes than my previous Retina. However, I HIGHLY recommend profiling the display to a warmer color temperature as that will help. It's easier than ever to do on the Touch Bar models. Typically I've used a D55 (5500 Kelvin) in the past on my laptops but find myself going all the way to the D50 (5000K) of my proofing monitor with the current model. This WILL alleviate eye strain even though it might look a little like old-fashioned skin-colored ladies' hosiery at first. You'll get used to it as it's a much more natural color as well as probably making it more likely you get the color balance of any photos you print more accurate. Go to System Preferences > Displays > Color > Calibrate > Continue, uncheck the "set native white point" function as that locks you at D65 (6500K), and move the slider to D50 (5000) and then continue to follow instructions.
There is a difference in the design with the October 2016 refresh that carries through to the June 2017 model; the previous Retina models had a WLED display with basically an sRGB-capable backlight in terms of the color gamut it supports. The current ones are different; I believe the underlying tech is still WLED but they're a bit sharper, viewing angle is slightly less as far as I can see, the backlight supports a much wider color gamut with P3, and is much brighter and uses less energy than the backlight on the Retina. So yes, it's natural to expect that it would take a bit of getting used to. I think the calibration I've described above would be useful to all and essential to anyone experiencing eye strain.