  Finetuning and Naturalness are extra-empirical theory assessments that
reflect our expectation how scientific theories should provide an intuitive
understanding about the foundations underlying the observed phenomena.
Recently, the absence of new physics at the LHC and the theoretical evidence
for a multiverse of alternative physical realities, predicted by our best
fundamental theories, have casted doubts about the validity of these concepts.
In this essay we argue that the discussion about Finetuning should not
predominantly concentrate on the desired features a fundamental theory is
expected to have, but rather on the question what a theory needs to qualify as
fundamental in the first place. By arguing that a fundamental description of
the Universe should possess zero entropy, we develop a 'holistic' concept for
the most fundamental layer of reality: The fundamental description of the
Universe is the Universe itself, understood as an entangled quantum state.
Adopting a universal applicability of quantum mechanics, in this framework the
behavior of subsystems can be understood as the perspectival experience of an
entangled quantum Universe perceived through the "lens of decoherence". In this
picture the fundamental reality is non-local, and finetuned coincidences in
effective theories may be understood in a way similar to EPR-correlations. This
notion provides a fresh view on the topic of Naturalness and Finetuning since
it suggests that Finetuning problems and hints for anthropic explanations are
an artefact of theories building up on subsystems rather than on the
fundamental description. Recent work in quantum gravity aiming at an
understanding of spacetime geometry from entanglement entropy could be
interpreted as a first sign of such a paradigm shift.
