It's been asked on this site what kind of material the Stormtrooper armor are made of because they seem to offer no damage resistance at all to blasters and whatnot.
What I'm interested in is why the First Order hasn't improve their Stormtrooper armor at all? The First Order is a group who wants to do everything bigger and better. They built Starkiller Base to be far bigger than the Death Star. They have massive amounts of armies and troops to use, and as implied in one cutscene in the movie, they are not using a clone army, but personally trained soldiers from birth.
So from this approach, if their armies are made up of men who they have trained for years, then why would they risk them by giving them armor from ages ago, that hasn't been improved upon at all, after all, the amount of Stormtrooper deaths in the movie is still quite plentiful, with most dying after one shot from a laser blaster or any other weapon.
So, the First Order has been trying to make everything bigger, badder, and better. However, their army's equipment has been far from favorable. They clearly have access to vast amount of resources; how else could they build Starkiller Base and the weapon to destroy their enemies.
Has the technology just not shifted at all in the many years since Luke triumphed over Darth Vader? Why would the Stormtrooper armor still remain the same after so many decades?