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iFixit hails replaceable LPCAMM2 laptop memory as a 'big deal'
(www.theregister.com)
This is a most excellent place for technology news and articles.
They could always lock in memory limits until you pay. But i don’t think they will anyway coz doing so won’t increase their sales.
If users have the "I can always upgrade later" option, that screws with the purchases of the higher end models "just in case I need it in the future".
Fun fact: You always use it in the future.