So, price to consumer may not necessarily the only metric of consumer harm that one must consider.

Another thing that is unique to large corps (Reliance, Amazon) is the network / conglomerate leverage they can bring to bear. Hina Khan's argument against Amazon resonates here too.

To quote from the work [1] that (I think) put her on the tech-regulation radar:

'This Note argues that the current framework in antitrust -specifically its pegging competition to "consumer welfare," defined as short-term price effects -is unequipped to capture the architecture of market power in the modern economy. We cannot cognize the potential harms to competition posed by Amazon's dominance if we measure competition primarily through price how integration across distinct business lines may prove anticompetitive'

[1] https://digitalcommons.law.yale.edu/cgi/viewcontent.cgi?arti... [pdf]