LOL quite

The more you look into it, the more it makes sense to have different kit for outdoors and studio

There is no all-in-one solution.
I think that if you want to explore lighting seriously, you need modelling lights, as it's just such a faff without that you won't bother and always play safe. It's one of the reason I always recommend studio heads for beginners instead of speedlites (the other main reason being fast recycle). TBH, I suspect that a lot of those with home portrait studios using speedlites simply put up a softbox or shoot-through umbrella, position it a bit to one side, and never change it. Basic, easy, foolproof, and also looks very good mostly, but they'll never develop creatively.
For still life and product work, I would simply hate to be without a modelling light. With that kind of subject, just moving the light a few inches, or tilting a reflector a few degrees, is what makes the shot.