Honestly, I have to ask why? You have to believe data. Choosing an amp should not be an Interior design contest. In my view power amps, should be out of sight and out of mind if possible.
My biggest beef with tube amps, is their high source impedance. This has to be so, as there is a coil of wire which is the secondary of the output transformer in series with the speaker.
So this tends to give credence to this notion of matching tube amps with speakers. Will this amp be a good match for these speakers? That is the question posed.
So lets take a look. I will use my designs for this illustration so no one goes looking for a match.
So here is the impedance curve of my three way Raymond Cooke memorial speakers in my family room. Now Raymond was designing speakers in the tube era, and so it was reasonable to try and get an impedance curve that would not get the worst from tube amps. So he used impedance compensation to optimize the curves for the time. So I did with those speakers.
So, if you look at that curve the lower FR regions, would be inclined to induce "warmth", and the 5 to 110 K peak "air".
Here is my great room center speaker.
Here those 100 and 200 Hz peaks of impedance would be inclined to induce "boom or boxy"
The 2K peak tend to elicit a "harsh" comment from listeners.
Now I don't want to suggest that tube amps will follow those curves to the letter, because they won't, and far from it. However there will be a subtle bias in that direction likely to be audible to listeners.
You get the idea?
I can see no good engineering reason to spend thousands on tube amps, because there isn't one.