Make TriggerBase constructor public

Is there a good reason why the TriggerBase constructor is not public (see https://github.com/dotnet/wpf/blob/ac9d1b7a6b0ee7c44fd2875a1174b820b3940619/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/TriggerBase.cs#L41 )

TriggerBase is part of the Core framework, but could be inherited by other libraries as well.

In my case I had the idea to implement a SwitchDataTrigger, that switches between different values of a binding, providing multiple cases at once - without the need to cascade through different Triggers, all with the same Binding.
I'd like to try implementing that as a library (for now) - not sure if it's of interest for WPF itself, but it get's ~~incredibly complex as I have to reimplement the whole basics again due to the internal constructor~~ impossible to do as I can't inherit from TriggerBase, but Style.Triggers requires all Triggers to derive from that.