I have mixed feelings about this. On one hand I miss being able to upgrade RAM at a later date without having to pay up-front for all of the RAM I'm expected to use for the lifetime of the machine. This is especially painful in 2026 with today's sky-high RAM prices caused by intense demand. On the other hand, the memory bandwidth in Apple's ARM Macs is tremendous, especially in higher-end Macs, due to the tight integration of the design. This matters greatly in memory-intensive applications such as generative AI. I feel less bad about non-expandable RAM given the tradeoffs, though it still makes for quite expensive computing, especially at 2026 RAM prices.
I guess Apple has finally achieved Steve Jobs' original Macintosh vision of closed-off appliances, though (thankfully) the NeXT Cube and the NeXTstation were not like that. RIP to Jean Louis-Gassée's vision of expandable, upgradeable Macs, starting with the Macintosh II in 1987 and leading to other fine Macs such as the Macintosh IIfx, the Quadra lineup, high-end Power Macs (8100, 8500, 9500, 8600, 9600, G3, G4, G5), and the Mac Pro.