RD just shoves the chain sideways it's the chain that moves your wheel . it, your RD does not have to be jewelry,
but if that is your need to have the best RD , thats your choice.

My un cheap bikes have internal gear hubs the folder a Brompton .. 3 speed ,+ 2 speed IG crank .. Swiss.

The other un cheap one , Rohloff.. as all 14 gear ratios are in sequence , when I was mid deluge wearing my rain cape

I didn't have to see what the gear ratio in sequence was . unlike double and triple derailleurs ..

AZ as a desert , your weather is different , the window gimmicks on the 2 shifters may be fine..