A recent news item in Nature promotes Wetterich's preprint "A Universe without expansion". All sounds very exciting but hard to judge for non-experts. As I understand from the Nature's article, the Wetterich's approach would be consistent with $\Lambda$CDM, thus providing a radical re-interpretation of known observational facts.
I've got particularly intriguing the following statement from the preprint's introduction: "Furthermore, an important feature is the simplicity of our model covering both inflation and present dark energy, dominated by the same simple quadratic potential."
Is it true that Wetterich's growing mass interpretation of cosmological parameters contains fewer assumptions than the usual (as far as I understand, separate) treatment of cosmic inflation versus radiation-, then matter-dominated epochs? And more generally -- are there additional merits of this unconventional approach to make it preferable over the present "redshift=expansion" dogma?
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