There are many different types of generalists.

People who are deep experts in one specific thing tend to trade off deep, useful expertise for closing off their horizons to other approaches.

You might call these mono-experts.

Most generalists are simply jack of all trades: minimally competent at many things.

These are non-experts.

Another type of generalist is a deep expert in at least two very different things.

This allows them to triangulate beyond any one expertise, to see bigger patterns and make connections in novel ways and not over-fit.

These are poly-experts.

Once you've developed your next expertise, the one after that will be even easier.

Finally, there's a type of generalist who is expert in being a generalist.

They can build a high-quality intuition on just about any topic relatively quickly.

These are meta-experts.

They work best when paired with a deep expert on the topic they're looking at.

The meta-expert can quickly abduct possible meta hypotheses that the person with encyclopedic expertise can quickly disconfirm.

This creates an extremely short-cycle dialogue loop.

Even better is when a meta-expert can create a community of a diverse set of poly-experts that engage in collaborative debate.

This is where the deepest and most useful insights can be generated most quickly.