@James, I don't agree with you.
Currently most of Lexus SUV's are in a normal product life cycle:
UX, introduced in 2018 as a MY2019, it's 2 years old and is rumored to have a facelift by 2021
NX, introduced in 2014 as a MY2015, it's 6 years old, received a facelift in 2017 and is rumored to be replaced by 2021
RX, introduced in 2015 as a MY2016, it's 5 years old, received a facelift in 2019 and is rumored to be replaced by 2022
They were introduced in a changing market but they're in a pretty normal product life cycle.
We can say it was bad luck for Lexus to launch them during a market change or we can say Lexus failed to properly understand were the market was going... But we can't say they aren't keeping them properly updated.
GX and LX will change drastically and they are not global products, it's a specialty product for a niche market and sales keeps proving they're up to date with the competition. X5's, GLE's, Q8's clearly aren't the direct competition. Also, Lexus keeps launching updated versions of them.