Even more devices are expected to get support for Android 5.1.1 in the coming weeks, as the community is working hard to bring the operating system to as many users as possible. Google tend to be more limited in their development direction, targeting specific devices instead, and most manufacturers have the same attitude.
But the community surrounding Android has always been very supportive and there are lots of users working hard to ensure that everyone gets access to the newest OS releases. Not only that, but we regularly see custom Android builds coming with various extra new features that even the standard Android doesn’t have.
The only problem in this case is that users have to take the risk of bricking their devices if something goes wrong, but at least the likelihood of that isn’t that great, and as long as one follows the instructions carefully, nowadays flashing a mobile phone or tablet running Android is a very safe and straightforward process. Even a bricked device can be restored with the right tools anyway, so that’s not much of a problem.