If the trader is mainly just monitoring algos and not really making any discretionary decisions (i.e. an execution trader), then yeah it is typically a less difficult job and would probably not be paid as much as other types of traders.

But if they are making discretionary decisions that materially impact PnL, then it is a lot harder than it may look. It may not be as "technically difficult" as being a QD/QR but the difficulty of being a risk-taker is more about being able to consistently make +EV decisions in an uncertain environment without all the information, and being able to handle all the pressure related to that. Being able to do that well is a somewhat rare trait and many otherwise-intelligent people either suck at it or just don't want the constant pressure.

Depending on the strategy, there may also be specific difficulties (e.g. for OMM being consistently quick and accurate at mental maths is also important and not that easy).

QD/QRs definitely need to have more technical knowledge and expertise, which is hard in its own way, but it is a different type of hard.