My father is struggling with this very question right now. He recently got forced into retirement and is trying to get into woodworking.The thing is, he is trying to spend his way to good work. That is, he looks at every tool as a way to make him better. The thing is though, if he would just take the time to learn ways of making things with the tooling he has, he would do much better.
My Grandfather made a decent retirement income with some sloppy sears tools that I now have. I also turnout some good stuff with it.
Let me pose the question back to you if I may. You are into muzzle loaders and flintlocks. Back when they were made,they had the most ancient lathes and tools, yet they made some decent firearms. Guns that launch a lead projectile at lethal force with an explosion of gun powder. How foolish we are to think that in todays times we need all this fancy gizmos to do woodworking that is far less critical then that whole muzzleloader stuff.
By the way, have you ever noticed all the gizmos that make a tool a "top choice" on media polls and choices are the features you seldom use? Most of that stuff is hype, to make their tools a bit better then the competition, that is all. A jointer makes lumber flat and square to one side. very seldom do you need to rabbit with it and yet if a machine does not do that, it is picked apart by the media doing the review. The same with planers, skilsaws and tablesaws.
I am very cheap and have gone through life with this mantra. I have a little pile of cash that everyone is trying to take from me. I will only let someones greedy fingers get into it, when I am firmly convinced what they are offering is worthy of getting my cabbage. Most of the time, I buy the tools others are discarding as they succomb to a salemans pitch.
As for the miter trimmer...I have one and would NOT be without one. They are incredibly accurate and simple tools.
I have no intention of traveling from birth to the grave in a manicured and well preserved body; but rather I will skid in sideways, totally beat up, completely worn out, utterly exhausted and jump off my tractor and loudly yell, "Wow, this is what it took to feed a nation!"