All work and no play makes jack a dull boy 中谓语为什么用makes

百度上有人的解答是这样的，我也认为非常合理：

这句话作者的意图是强调“all work and no play”为一个整体，故相当于第三人称单数，所以用makes。

我在coursera的一门英语写作课上向一位老师提问，他的回答如下：

You would think that with a compound subject the verb should be "make," but the sentence is a proverb, a folk saying, and folk sayings are notorious for not following the rules of grammar.  Best, Larry.

其意思是“All work and no play makes jack a dull boy”是句谚语、俗语，而谚语俗语通常是不遵守语法规则的。

例如下面还有一句Benjamin Franklin说的谚语：

Early to bed and early to rise， makes a man healthy, wealthy and wise.