Currently, Weld doesn't allow wildcards in IPs with Event or Instance.
Something like @Inject Instance<?> will result in a validation error coming from ValidatorLogger#injectionPointHasWildcard.

However, there doesn't seem to be anything in the specification preventing this and, at least for Event, you can basically bypass this already by using Instance.
I.e. you cannot do @Inject Event<?> but you can do Event<?> event = beanManager.createInstance().select(new TypeLiteral<Event<?>>() {}).get();

Trying this locally, I saw no issue in the current testsuite either, so we could just remove that.
FTR, Quarkus Arc allows this as well.