It probably is (time for change) but it would be interesting to know exactly what is involved in gaining IFR certification.
There is the implied suggestion in this thread that it is only concerned with instrumentation, however for me IFR certifcation should also say something about how the aircraft will behave if struck by lightening, or have to cope with the vast amount of water that might be trying to drown the engine in some cloud, never mind how stable the aircraft might be on an approach dowm to minima in choppy conditions.
In short the instruments may well be up to the job, but is the aircraft?
The fact the aircraft can pass through a few hundred feet of benign cloud to cruise "on top" may not be the only use a pilot has in mind once he hears it is "IFR certified".