Nope. I love railways. They’re brilliant, really genius pieces of engineering. Ask my wife, I can bore the socks off anyone. Railways are marvellously complex bits of mechanical, electrical and social engineering.
The PSA on a DLR train isn’t a trained customer service monkey. They have to have full route knowledge and full procedural knowledge as well as technical knowledge about how the train works to operate it in this restricted mode. There are other parts to this equation for sure- the control room staff, the technical staff, but it’s not just “durrr monkey push button make train go”.
Moving trains outside of signalled protection is a risk-ridden process where trains can (and have been!) derailed, risking lives and huge asset and infrastructure costs. This is prevented by having systems where people are trained to a high degree to reduce that risk as low as reasonably practicable. Ultimately what train staff are getting paid for is what they know, not what they do.
Yes, anyone with fingers can push a button. Anyone with a hand can move a lever. Knowing what button, at what time, in which sequence, to do things safely, is the trick. Turns out that’s not so easy, especially when you’re under pressure.