Any reason why they couldn't use SODIMM DDR4? It's 1.2v of DDR4 vs 1.2v of LPDDR3. I would like to see some hard facts instead of everyone simply quoting what

Any reason why they couldn't use SODIMM DDR4? It's 1.2v of DDR4 vs 1.2v of LPDDR3. I would like to see some hard facts instead of everyone simply quoting what a marketing person from Apple had to say. IMHO, it's just that they didn't really didn't want to go through the trouble - the % of their target users requiring 16GB+ isn't that large.