There are already manufacturers who do in-body correction alongside their lens design to get results that would require a ton more glass; Olympus are one. Sites

There are already manufacturers who do in-body correction alongside their lens design to get results that would require a ton more glass; Olympus are one. Sites like DPReview use it as a relentless talking point that those manufacturers are sub-par compared to the big advertisers. It's the photography equivalent of "if you were a real audiophile you'd only use pure analogue signals, digital destroys the sound".