Annoyingly my 15” rMBP from 2015 is no longer being upgraded to the latest OSX. Whilst it’s been showing its age in a few ways, it’s been one of the finest pieces of tech that I’ve ever owned. I think the 16” MBP would be an ideal upgrade. Part of the reason my old one lasted so long is that I doubled the memory to 16Gb. I’m not sure I need more than the base 24Gb really? If I’m honest I’m not really doing anything hugely intensive on it anymore.