If they can create their own gravitational field, then what other technologies would exist that they could use that would make travel to us from where ever they are pointless. If they have a level of technology that can do that and a fuel source to power it for huge amounts of time then it is reasonable to state they also have the level of technology that would make visiting worlds pointless. As well why would they ever keep themselves secret. Unless we really want to delude ourselves that some kind of nonsense like "Wait until the species is ready for contact." would actually be real. The most reasonable expectation is that they would not consider us at all so might as well not be real.
If they can create their own gravitational field, then what other technologies would exist that they could use that would make travel to us from where ever they are pointless. If they have a level of technology that can do that and a fuel source to power it for huge amounts of time then it is reasonable to state they also have the level of technology that would make visiting worlds pointless. As well why would they ever keep themselves secret. Unless we really want to delude ourselves that some kind of nonsense like "Wait until the species is ready for contact." would actually be real. The most reasonable expectation is that they would not consider us at all so might as well not be real.