Actually based on what I’ve learned about it, the paradox is actually doing both things: it’s assuming over enough time scale our technology evolves rapidly enough to unlock new physics to traverse the universe we don’t have today while simultaneously being able to detect it using insanely primitive technology by comparison. It would be like asking someone to detect an atomic explosion in our solar system in 1930 - an explosion we’d likely not even notice today I suspect. There’s simply not enough understanding, we’re monitoring too little of the universe, and the equipment to do the monitoring is too primitive if technology really continues to advance at the pace posed by the Fermi paradox.
Basically the Fermi paradox says “after the invention of modern science and Industrial Revolution, within a couple of hundred of years we were flying, within 50 years we’d left orbit and within 20 years or so we’d reached a moon. So surely after a few hundred thousand years the society should be able to reach and have colonized huge swaths of the galaxy”. But that kind of advancement would be at odds with our ability to detect such signatures and what we’re doing today is hypothesizing crazy sci-fi ideas and looking for those signatures with insanely primitive tools that have poor resolution. Communication we have 0 chance of spotting (encryption + energy efficiency = noise). Dyson spheres are interesting to look for but it’ll be a while before some novel ideas for how to spot them pan out (and that’s assuming the clever ideas are correct about what the footprint would look like and that Dyson spheres would be needed for long distance travel vs wormholes).
However based on our current understanding of technology long distance travel is simply not possible - the Milky Way itself is 100k light years across. Even at 10% light speed that’s 1 million years to traverse the galaxy and ignores the challenges (surfing that kind of distance traveling at such speeds and avoiding all kinds of things flying through space). And visiting (let alone building major hubs) various star systems is going to take significantly more than that. If you can only manage 1% then that’s a 10 million year undertaking just to go from one end to another. It’s easy to imagine that visiting many star systems would take billions of years and that’s with technology we don’t know we can even build. And ignoring the practical challenges of going that fast, needing to survive, decelerating, and ignoring the economics of creating a craft that can undertake and last a 100k year journey at relativistic speeds.
And saying we don’t have scientists working on this actually proves my point that there’s no paradox - no one is really working on this problem using very poor sensors trying to think as creatively as they can with basically 0 knowledge (compared to a civilization many thousands of years older than us) for signals we don’t know how or where to look for. So of course we haven’t found anything.