What is perplexing about HP and some other printer manufacturers is that they continue to support their hardware for Windows but not for macOS.
There is some history to the relationship HP has with Apple and their products. When Steve Jobs returned to Apple there was already in place an agreement between HP and Apple for HP to provide their printers to Apple for Apple to OEM under the Apple name. (Like what Canon did for Apple with the early LaserWriters.) Steve didn't like the deal and he yelled at HP and ultimately cancelled the deal.
Ever since, HP has seemed to only begrudgingly support Apple products. I think that Brother saw that there was an opportunity there, and has pursued and supported Macintosh users more aggressively.
But that does appear to be changing for some as Mac computers become more popular.
I think that the whole "Macs are becoming more popular, so X will be different" is a line of reasoning that doesn't comport with the facts.
There were about 94 MILLION Mac users as of 2010, according to industry sources
Number of MAC Users
In 2018 that number surpassed 100 MILLION
The Mac grew by 29.1% in 2020, increasing its market share from 6.7% to 7.6% in a PC industry that continues to see record demand.
www.imore.com
I think that Macs have been plenty popular for a long time now.