Why the hate for mcintosh amps?

" Greatfull dead/Jerry Garcia’s Favorite McIntosh 2300 Amplifiers weren’t owned by them, and were owned by nobody they’re worth around 3K.
https://www.ebay.com/itm/363362695974"

That would be the "Grateful Dead" and the link you posted was an amp for sale, not one that has sold. All amps in the auction sold, I do think at silly prices, however just pointing out. The value to one may not be the value to others.

Since the output transformers allow for 2 4 or 8 ohm (i use 4 ohm) variations in speaker needs, why do they have separate connects for each?

why not a single/universal connect to speakers that can handle all 3?.?.?

I guess that the different speaker binding posts connect to different windings within the Autoformers.

Since the output transformers allow for 2 4 or 8 ohm

why not a single/universal connect to speakers that can handle all 3?.?.?

Has to do with "output impedance" of said transformer tap. (damping factor) into the speakers impedance to control the speaker cone movement, and getting the "most wattage" without losing control for that speaker driver.
The lower the transformer tap the lower the "output impedance" the higher the "damping factor", penalty is the lower the tap the lower the wattage also.

Cheers George

Spkr says rated for 8 but told to use 4 , b&w 802 d3.  Does it matter?

lower the tap? Is 2 lower than 8?