I spend a lot of time researching paints before I buy one, planning how it will fit into one of my existing palettes: what niche it will fill; how it will play with my other paints; what I’ll be able to paint and mix with it that I can’t do now, or can’t do as easily. I’ve had some triumphs (THIS COLOR IS AMAZING) as well as some missteps (Huh, I just… never use this one.) So I have A Lot Of Thoughts on how to build a palette from the ground up that works for you, full of lovely paints you’ll enjoy and that will be versatile enough for everything you want to do!
tl;dr All this is subjective. There are no rules. Get the colors you want.