I agree to pick up 16gb ram first, if there’s no speed issue on SSD, which is not the case.For their uses, that disk speed won't really be a factor though. And if they go with 16GB RAM, they'll be swapping a lot less too.
Even simple operation like file copy was affected. There are some youtube video testing this. The performance impact will be noticeable since you start using the machine (boot the machine, due to read speed is 50% slower compared to 512gb version). It’s not like 16gb ram where the benefits start showing when you open many apps.
You may use external disk, but it won’t be practical as you need to move boot disk from this slow internal SSD to the external SSD to gain the benefit - which is complicated process for average users.
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