No, it is not accurate to say that Quantum Electrodynamics (QED) only predicts the results of simple laboratory experiments and not complex physical phenomena. QED is a highly successful quantum field theory that describes the interaction between electromagnetic fields and charged particles, including electrons and photons.
QED provides a theoretical framework that successfully explains a wide range of phenomena, both simple and complex, in the realm of electromagnetism. It accurately predicts and explains phenomena such as the behavior of electrons and photons in various electromagnetic fields, the scattering of particles, the emission and absorption of photons, and the interactions between charged particles.
QED has been extensively tested and verified through numerous experiments, and its predictions have been found to be in excellent agreement with observational data. It provides a robust framework for understanding and calculating a variety of phenomena, ranging from the behavior of subatomic particles in particle accelerators to the properties of atoms, molecules, and materials.
While QED primarily deals with electromagnetic interactions, it is part of the broader framework of the Standard Model of particle physics, which encompasses the other fundamental forces of nature as well. The Standard Model, including QED, successfully describes a wide range of phenomena and has been validated by extensive experimental evidence.
However, it's worth noting that the full complexity of physical phenomena often involves the interplay of multiple forces and the consideration of additional factors beyond those accounted for by QED alone. In such cases, other theories and approaches, such as quantum chromodynamics (QCD) for strong interactions or general relativity for gravity, may be required to provide a more complete description.