This is correct; except that companies need to make tough decisions based on actual sales. I suspect that for Mesa, they must have simply decided that the actual sales of their big tubers didn’t justify the production / support costs. I mean, were the contrary true, they would be foolish to drop the products, right?A good point.
However, the big 4 classic tube bass amp manufacturers were Ampeg, Fender, Orange, and Mesa. All of those companies also make modern Class D amps for changing times.
However, three of those companies still make their big classic tube amps for their long-term customers who still desire that old-school tube tone: Ampeg has the SVT, Fender has the Super Bassman, and Orange has the AD-200B. The only one of the big 4 that abandoned the big classic tube bass amp (and its long-term old school tube amp customers) and went all-in on Class D was Mesa.
I venture it is possible to design updated new products for newer tastes while also not alienating a very large section of your immensely loyal customer base that has stood by you for 35 years.
The tech is actually moving headlong further in other directions. Ampless stages, especially in bigger venues, are by far becoming the norm. Though you and I may have different tonal objectives, we may likely be in the same camp preferring backline signal chains. I am still STRUGGLING with the ampless transition; and WAY more than the tube power section vs Class D “debate.” But, that’s a whole different thread.