Without a doubt there is the tech to do it, but that tech is a trade off. In order to make the pen chargeable costs would go up, battery life would be drastically cut, there would be an impact to the Surfaces battery life, and the only USB port on the device would have to be consumed by the pen for charging.
The issue, in my mind, is not so much one of available tech, but more trade-offs to benefits. In my mind (and obviously the minds of the designers too) the small benefits don't outweigh the trade offs. In the end the batteries in the pen lasts months already, so it's not like the the battery consumption is huge.
The shelf life of current single use Alkaline and Lithium batteries is 7-10 years. The upkeep of keeping your batteries fresh is next to nothing. Hell, if you buy a 4 pack of batteries, and consume 1 every 6months you won't need to worry about them for 2 years.
No, I have several piles of micro-USB cables. They are used for charging a lot of my devices. However when I am out on the road I don't bring any with me. They are bulky (far bulkier than 1 or 2 AAAA batteries), get in the way and make a mess. I instead make sure I am fully charged before I head out and leave all cables at home. Batteries are a much preferred option than cables.
Costs would go up? Really? We are now at SP3; it has lots of changes different from the original SP--things that might lead one to conclude (back at the original SP days) to say, "No, that would increase costs, so don't do it" but here we are today with a much-improved product.
This is technology we are talking about; it improves over time and its costs decreases over time. My Bluetooth earpiece is rechargeable; my mouse is rechargeable; my cell phone is rechargeable; my MiFi is rechargeable; I even have an automatic soap dispenser at home that is micro-USB rechargeable--a
soap dispenser of all things!
And you mean to tell me that my Surface Pen cannot be rechargeable without greatly tipping the scale of the cost of the Surface?
As far as shelf life is concerned, when you buy one of those battery packs off the shelf, how long has it been on that shelf? The bottom line is that you do not know how long they will last and you have to be mindful of that and manage the situation accordingly.
No arguments here when it comes to cables, though! Whether they're earphones, computer cables, electrical cables, or whatever, I always end up in a tangled mess!
Seriously, though, that's why I even upgraded my Bluetooth earpiece and standardized on one cable that can support both micro USB
and Lightning. Unfortunately, it doesn't look like I'll be ditching from the iPhone anytime soon, so I'm stuck for a while.