I think the issue is the disconnect between these two sentences:
"VST3 support is now fully integrated across all versions of SONAR X3".
"I realize it will take time to implement, but until then, there is only limited VST3 support."
The claim is that all versions of SONAR X3 support VST3. This is true. If you load a VST3 plug-in, SONAR will recognize it.
The DEGREE of support of any spec varies according to manufacturer, unless that spec is a STANDARD (these are two different things and also factors into the confusion). A STANDARD sets out rigid, specific qualities that a piece of gear must address. For example with traffic lights, red = stop, green = go, and yellow = caution is a standard.
A specification is less rigorous. For example, in the United States, yellow is used only when transitioning from green to red. In Germany, yellow is used also when transitioning from red to green. Both support the use of color for traffic flow, but the way they support the use of color for traffic flow differs.
For music, the best-known and most common example of this is MIDI. The MIDI specification includes numerous features.
No piece of gear in the entire universe implements all of them. None. Yet all MIDI gear claims to support MIDI. Whether they choose to support MIDI Show Control or polyphonic aftertouch is up to the manufacturer.
In the case of VST3, support is "bidirectional." For example SONAR might support an element in the VST3 spec that is not supported by a VST3 plug-in. Conversely, SONAR might not support an element in the VST3 spec that IS supported by a VST3 plug-in. Yet in both cases, SONAR and the plug-in support VST3. What is chosen to support or not support is up to the manufacturer.
This is why much MIDI gear includes a MIDI implementation chart that notates which functions are supported and which are not. I do not know whether such a standardized document has been released by Steinberg, who are the "keepers of the VST SDK," but if they had I think I would have seen it by now.
Keyboards are not referred to a "crippled" because they don't include, for example, polyphonic aftertouch or MIDI Show Control. To start choosing products selectively and decide that some are "crippled" because they don't support functions while other are not "crippled" even though they don't support the same functions is arbitrary at best. The question of supporting a specification, and the
degree of supporting a specification, are different questions.
And the question of supporting a
standard is a VERY different matter. This is why there are governing standards committees for organizations like the Audio Engineering Society and Consumer Electronics Association that define a standard with exceptional specificity,
including which elements are optional because it is understood not all elements of a standard always have to be implemented. The same is true for specifications.