As i mentioned,such reasoning would make around 10% ~. It wouldn't be a ww2 once again. Even a simple drone could spy on ships from above, what to speak about advanced radars etc.Ok so they want to build a secret "One Belt One Road" without us knowing? LOL So why don't they just tunnel it underground or transport everything using submarines? LOL
I think the reason was mentioned in the article, - they just want to have it all under control.
And on this one i have no right to say anything. Their ships, their choice

Another reason, - they recently remade this cruise ferry into a military ship. Who knows, maybe some military ships would be disguised as civilian ships. The land of Sun Tzu and a homeland of IT theft, so, anything is possible.