No evidence in a situation where evidence is very easy to observe. No concern. Vaccines are more effective than their initial claims. No variant evades moderna or Pfizer, despite the fact that even if one did, it would be easily controlled by a booster.Absence of evidence is not evidence of absence. The whole point is, nobody knows what mutations will happen (other than that we know they will) and what the effect of those mutations might be - Covid came as a surprise to governments all round the world, after all. We also know that vaccines exert an 'evolutionary pressure' on viruses. Yes, we're all better prepared than we were a year ago, but variants can/could still cause us all a lot of trouble (I don't need 'evidence' to believe that!).
No evidence, no evidence of any need for fearmongering or unscientific policy making.