Budget aside, its typically a matter of the space one has in a shop, or portability for site work. There is typically always a way to get a job done with any number of tool combinations.
I have an impressive collection of tools, many in duplicate. Cabinet saw, multiple job site contractor table saws, multiple miter saws, drill press’s, jointer, surfacer, router tables ect, and all manner of specialty tools - beam saws, mortise machine, dowel and biscuit cutters ect. I rarely use most of them anymore.
You’re industrious. I recommend the minimum. When one is not in a situation where time allotment is critical, one can do a great many things with very little. A track saw is fantastic and versatile tool, and with a little ingenuity, can largely sub in for a table saw. Router table and handheld routers, sometimes combined with jigs, can also punch outside of their weight, and the list continues.
Battery powered tools are great, especially when you are mobile. I have battery versions of most tools for site work. A battery sliding miter saw for crown molding and trim work for instance. With modern battery systems, these are quite capable. Personally, outside of specific use cases, I consider battery tools temporary. For specialty tools, tools that don’t leave the shop, or tools that get heavy use, I always opt for corded. For instance, I’d typically opt for a corded grinder if it was my only grinder, but if I was using it for prepping tack welds and the like, I’d opt for the portability of a battery operated. If I was using a multitool for a large project, I’d opt corded. If I was climbing a ladder to splice a piece of siding in, I’d opt for cordless.
Track saw - I have Festools, but I would recommend the cheapest you can find with compatible tracks, most tracks are cross compatible, but some aren’t. Makita, Festool, and most of the clones all use the same track geometry, Dewalt does not. There is no real difference, buy the cheapest with palatable reviews. Buy largest track you care to use, and a small one. I buy large tracks and cut them down for fixtures. Like cross cut table ect
I tend to avoid modern Bosch tools, same for most porter cable. I’d venture to say the majority of mobile tools I have are Makita. Dewalt has had its ups and downs, some of my favorite and longest lasting site tools are old Dewalt tools. At least the modern battery tools seem to be of good quality, and I’ve picked up a variety of cheap small stuff from them in the last few years, sanders ect, all seems nice enough for the price point.
Hitachi, which now owns a Metabo, makes a good many tools I consider professional quality. Nail guns are a prime example.
Festool is not what I’d consider a professional quality tool. Its a vanity tool. In my life being on site and working with some real craftsmen(Which I am not), I’ve only ever seen a few outfits using it. I imagine the pricing is different in the EU, but in the US, it does not make sense. The tools are not, by any stretch of the imagination, durable. But they have some cool stuff, and I own plenty of it, but it isn’t necessary or magical. If I was just starting out, I’d avoid. If I was a professional, I’d largely avoid unless they produced a specific specialty tool for a job I was doing.
Anyway, I am rambling. I could probably continue forever. It all really depends on the job. I am happy to buy a 5k beam saw for a single job when I have to cut a lot of beams, or a boring machine when I have to make lots of inline holes, but these are not “required”. A circular saw, recip saw, and dril or plunge router will do both jobs for fractional money… plus so many other things.