A general purpose computer can do nearly anything you might want or need it to do musically, desiring hardware is really just about the interface, both the physical tactile element and the virtual layout and flow. Also I think a big reason for people’s drive to go ‘DAWless’ is that a computer can do many many things, but you only actually want it to a handful of actions when making music, and having such a large space of possible events can be a hindrance. This is especially the case in frenetic live performance where clicking the wrong menu item or some operating system interruption can completely derail you, for those doing non-realtime composition it’s much less of a concern.
I generally recommend doing the most with what you currently have (presumably some sort of computer) and experimenting with software to see what you find inspiring and effective, and then consider if a particular bit of hardware might make that process that much more fun/easier/interesting/better sounding.
For me I know that if I was able to spend the time to learn and make something very bespoke in like Pure Data which is free, and combine that with some good MIDI hardware (which I already have a fair bit of) then I would be much closer to having the production system I dream of. I’ve definitely realised that in order to do what I would like to do live I need some kind of system that has well defined limits and is very reliable plus very tactile and responsive hardware. I’m pretty happy with the few bits I have at the moment like the Octatrack + MIDI controllers so I’m going to focus on learning their capabilities/limitations as best I can and then go from there.