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To understand this fundamental restriction to observing our physical universe we need to reflect on what observing entails. Let’s imagine it’s equivalent to what we do with our eyes, or microscopes, which is bouncing photons of electromagnetic energy off of objects and collecting them afterwards to make an image. Einstein and many others over a century ago showed that the wavelength of light is inversely proportional to the energy of the light photon - this is part of wave particle duality. From optics we know that to resolve, or clearly see, an object we need light with a wavelength that’s of the same size as the thing being observed. So to see really small things with electromagnetic radiation you need very low wavelengths. And the flip side of tiny wavelengths is huge energies- remember, they are inversely proportional. At the Plank Length a packet of energy needed by an observer would, by definition, need to be incredibly small but would also be exceedingly energetic and if you fold the size and energy into the notion of the density of the energy you suddenly encounter an unexpected and impressive phenomenon: the breakdown of conventional physical forces and the generation of a minute black hole! This is, of course, a theoretical model but the science, which crosses in to a quantum model of gravity, is widely agreed upon.
So literally to observe at the Plank level requires photon energies which cause black hole formation.
