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They also doubled (!!!) the SSD speeds, at least according to their slides. Presumably swapping will be much more seamless, so I'm not sure low RAM would be a huge issue for most day to day tasks.

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It will still be a problem. The difference in access time between RAM and SSDs is still order of magnitude faster for RAM (10s of micro-seconds vs 10s of nano-seconds). So even if they doubles speeds random access of small data chunks will still choke your performance.

Yes, Apple SSDs are back on the leading edge, they were about half the speed of the fastest Gen4 SSDs.

Low RAM is still an issue with such fast SSDs, as someone who ran RAID0 Gen3 NVMe SSDs (so equivalent to what's in there).

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