High refresh rates seem to be the new battleground for mobile display tech - but do you actually care? Naturally, gaming phones were the first to adopt this feature (starting with the Razer Phone in 2017), now it has crossed over to mainstream flagships. Last year 90Hz was pretty popular, this year the industry is moving to 120Hz. We know that the Samsung Galaxy S20 and the OnePlus 8 phones will sport 120Hz displays. Xiaomi even demoed 144Hz overclock for the Redmi K30 5G's 120Hz screen (just inside the lab, this mode hasn't been officially released to consumers). Enabling a high...