Based on the reports I have seen on the forums, the power accuracy is terrible. Usually way over what is actually being produced. If you are serious about training and getting faster, you will want accurate power, heart rate, and cadence. A good set of power meter pedals will solve the power and cadence piece, then you will want a good HRM (not those silly things on the handle bar that you grab onto to measure HR, I’m not sure if the IC4 even has those). These are the metrics you want to track and improve to get fitter and faster.
If you don’t care about accuracy and just want to ride around and have fun, be social, etc. then it doesn’t really matter. However, if you plan on racing and being competitive please use an accurate power source, or you can really ruin the experience for everyone else in the race that has accurate power sources and aren’t intentionally sandbagging (entering a lower category to get an easy win rather than racing against people of similar ability).
If you just want to ride the bike and watch Netflix, or do a virtual spin class then accuracy doesn’t really matter. It really depends on your overall goals.