Other devices? Other features?
Why, dear EU, do you stop at fifteen types of device?
There are many other electrical devices which should have been included. (Though maybe applying to new models only, or some such get-out clause?)
Shavers (come on, Philips) and trimmers. Toothbrushes (or at least, the charger bases, come on Oral-B), water flossers, etc. Torches. Lower-power kitchen, garden and workshop tools/chargers. Smart meter remote displays (mine, yes, it really does have a micro-USB connector despite being brand new the other week). Blood pressure, TENS, and other health-related devices.
However, I would like to see a specific improvement such as others have suggested. First, breakaway connections like new MacBook MagSafe. Second, a waterproof version which enables safe use in wet, steamy environments (possibly power only, using Bluetooth for data if needed). It's quite easy to see that it might be possible to come up with a standard which addresses both issues in one. Even just a USB-C waterproof blanker could help protect devices when not being charged.
Let us also see a universal visible marking scheme to help identify chargers, cables and devices and their capabilities/requirements. For example a single green band meaning it conforms to some basic level, double orange that it goes up to 60 watts, triple cyan that it is good for 100 watts. Something that has negligible cost, is easily visible, doesn't rely on colour alone.
If you look at Amazon, many vendors are offering USB-based devices in many of these classes. Though sometimes they use micro-USB, USB-B, or some proprietary aspect. Get everyone over, please. Let me go on holiday with just one charger!