Yes, no, maybe, I don’t know.
Is it wrong to be onesided? No. I don’t see any danger in it, unicycling isn’t generally a onesided enough activity for you to get any muscular imbalances. Most people can’t write with their non dominant hand, can only shuffle cards in one way, etc. What I’m saying is, in some ways, being better on one side is normal.
Is it great to be versatile? Yes. For example, Eli Brill (amazing Flatland rider) is able to do almost all his unispins in either direction, which is pretty cool, and is very versatile in combos. Aidan Teleki can sidehop more than a meter with either foot forward, which is probably handy on some trials lines.
Should you practice to be good on both sides? I don’t know. Depends on your goals I’d say. Bike analogy, no one (at least that I know) practices mounting their bike from the opposite side then normal. If all you want to do is ride around the park, I don’t see much of a point. If you want to be really good at downhill, you have to have a certain amount of versatility when it comes to hopping with either foot. It definetely isn’t wrong to spend time to learn tricks on both sides. (Or for some tricks like unispins, there are even 4 different ways to do them, if you combine all different footstances and spinning directions)
Personally, I practiced landing with the opposite stance for Muni, and it’s proven really helpful there. Some random tricks I’ve also learned to do on either side, like riding one foot, idling, mounting. To be honest, I learned those mostly either out of boredom/couriosity on how fast I could learn them. It’s mostly only proven useful when explaining tricks to people, so I could match what they are doing. (For example, it’s a big difference for the transition from one footed to gliding whether you ride one footed with one foot and have the opposite foot on the tire, or use the same for both, and being able to show both is a neat thing as a trainer).
I choose to mostly spend my time learning more tricks/things vs. spending time learning the same tricks in multiple ways. Some people really see a lot of value in being symmetrical, and I don’t want to dismiss that (sorry if I may have sounded like I did that in the past), I just don’t find much value in that for me personally.