But as often China is capable of drawing a plan over 50 years and to execute it over that time frame.
What they are doing is developing and reshaping global trade routes around China.
That's a strategic, long term plan.
And yes, building roads and railways will expand the economy. Let's remember how the US developed the West.
Also, the only "50 year plan" I can think of is Den Xiaopin opening the economy, and it went through because he was still powerful and alive until a few years ago. And it was more like a 30 year plan. Do you know many great long-term successes from them? Because they're more famous for things like the great leap forward.
Of course not. Building trade routes and railways to span Eurasia is thinking 50 years down the road.
You said "But as often China is capable of drawing a plan over 50 years and to execute it over that time frame". Can you give (multiple since you said "often") major 50 year plans, that China announced and then delivered on? I don't know all that much on that topic, and as I said before their most famous efforts at planning/reforming didn't turn out too good.