Sadly, those speaker level adjustments were often unreliable over time and the cause of much frustration.
Modern speakers are not designed for an anechoic chamber, but the measurements may be done that way in order to properly set crossover points and alignment. No competent speaker designer I know of would build a speaker for an anechoic chamber.
I do however agree that good tone controls in your preamp are wonderful. I’ve had gear with good and bad tone controls, so I can understand the reluctance of some listeners to use them again, but good ones exist!
No one's room and no recording or hearing is perfect. Let's be good to our enjoyment of music and use tone controls!