There are actually NuGet packages for UI for Xamarin that you can currently download from your Telerik account and upload to your own internal server from which you can reuse them within your company. To get the NuGet packages go to Your Account >> Products & Subscriptions >> DevCraft Ultimate >> Download Installer and Other Resources >> UI for Xamarin Cross-Platform >> Browse all product files >> Telerik_UI_for_Xamarin_2016_1_204_3_NuGet_Dev.zip.
Pretty soon (about within a month) we will also provide our own NuGet server from which you can get the latest versions of UI for Xamarin without downloading them from Telerik.com. This will let you easily update to the latest versions we release to match the latest Xamarin Forms releases.
Currently, we are working on Windows Universal support, which was the most requested feature lately. This will allow us to more easily switch to Universal Windows Platform support, once it becomes official for the Xamarin Platform. If you have other feature requests, we will gladly hear them in our UI for Xamarin Feedback Portal
Shortly said, on top of what I mentioned above, we are not abandoning UI for Xamarin in any way, so you should not abandon it as well. It is a strong selling point for our .NET audience and we will continue investing time and efforts into developing that product further.
Regarding your feedback that 'one platforms controls work differently than others', I would be happy to hear more details about the exact behavior that you experience. In some cases, this could be because each control is built to match the look and feel of the respective platform it is run at, but your case could be something else. Please open a new support ticket where we can discuss the details and exchange projects if necessary.
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