@sughosh: Memory is soldered as with most of HP's ultrabooks. Lenovo Ideapad 720s 14" is overall a much better non max-q MX150 laptop with an open RAM slot, or better yet their Thinkpad T480s that runs on dual-channel memory.
if the buyer needs a device weighing 1 kg and fit in a purse, he did not even look in the direction of 15 inches or 1.9 kg weight , as you suggest. and what good is your idea then?
One suggestion, instead of comparing 13" laptops together, why not compare laptops of similar processor types and weight?
In this instance, suitable candidates to the Envy 13 would be laptops around 1.3 kg / 3 lbs that have 15W CPU and MX150 GPU like the reference quality Huawei Matebook X Pro mentioned in the review.
To name a few - Lenovo Ideapad 720s 14", 530s 14", Thinkpad T480s, T480, Asus Zenbook UX430UN, UX331UN, VivoBook S430UN, S330UN MSI PS42, Samsung Notebook 9 15", Acer Swift 3 14" and AMD Ryzen 7 w/ Vega 10 fall under this category, despite their varying display sizes.
Fancy. HP's slim 13.3-inch subnotebook features a fancy exterior and good connectivity. Hewlett Packard has fitted a quad-core processor and a dedicated GPU into the slim case. Good battery runtimes, a fast SSD and a matte Full-HD IPS screen complete the package.