Prior to owning a digital camera with a top LCD I lusted for one so much. It was one of my top criteria in opting for my ill fated Sony a77 Mk II. Once I got the a77 Mk II I quickly realized, within days, that I never used the top LCD! Why peer at the small LCD when you have a bigger, brighter 3″ LCD inches away. As of then I came to the conclusion that top LCDs are a waste of time, money and space — particularly the latter.
Give me a dedicated exposure compensation dial rather than a top LCD.
So the top layout on the Canon M5 is another feature going for it.