Is Having Many Different Projects At The Same Time Good or Bad?

I am struggling with the fact that I always have a number of parallel projects going on at the same time, and whether this is a good thing – as it is sometimes a struggle to deal with all of them at the same time. The problem is that I can be passionate about many ideas. Some well-known entrepreneurs like Elon Musk pursue many ventures at the same time while many others underline the need to have focus (Focus – as a driver of excellence as the title of a book by Daniel Coleman).

Let’s analyse the situation. Having many projects at the same time:

provides interesting options and wider encounters,
Is a great way to manage the risk of failure of a project by having several others at various stages of development,
allows to identify and develop synergies between projects and related social groups.

On the other hand, limiting the number of projects:

allows focus and more chances of success through stubborn attention,
allows to manage workload more easily (less conflicting calendars!),
requires less resources.

It may be because of my nature but I think I like to keep having several projects. I realize however that for this to work, I need:

to be able to drop projects that become excessively time-consuming with poor results,
in general be mindful to limit time involvement to a certain limit,
find ways to make it work time-wise, for example by combining projects that are flexible (do not require a lot of interactions) with projects that bear significant time constraints,
seek the maximum of synergies, if possible.

Any other suggestion?