Half-finished projects clutter your space and your mind. The biggest satisfaction is what I get from a project that is done-done. Not finishing anything will rob the satisfaction of a project.
Doing some Marie Kondo (deciding which things bring joy and getting rid of the rest) for your hobbies has been immensely liberating. Saying no to myself and not starting something new leaves space in my mind to enjoy other things much more.
So I would say, be picky about which hobby to take on and once you do it, be ready to invest some serious time into it. The joy you get out of a nice coffee table you built yourself from scratch is immeasurably greater than some tools, lumber and dust blocking your garage for years.