It does not work "fine" at my iMac Pro, but to answer your question, i just cancelled my paid subscription and paid out my Linden$ to Tilia and back to my RL PayPal. And after 18 Years of SL it should be no question, that SL was important to me.
Some of my creations do not work anymore with the new viewer, hairs are gone, alphas do not work correct and the environment is shiny, bright and simply wrong. There are tons of complaints about Mac compatibility and PBR, especially the latest Apple Silicons. It does not work anymore.
Thank you for the helpful hint about Cool Viewer, i will give a try. But i am pretty sure that future releases will force PBR Viewers and we will see if it is fixed by LL or not.
I don't buy any subscription, no membership, no Linden$ anymore, if it is not working correct.