I don't know when is the last time you got involved in marketing but if anything, the metrics driven culture is precisely a free pass allowing to justify any decision whatsoever, through a careful selection of data points and scale, whether intentional or accidental. God forbids having to point out to your manager that he mixed up the X/Y axis and sales have been decreasing month over month, not increasing.

By the way, a lot of marketing is still not quite metrics driven. Unlike the internet, when spending money on national TV, sports teams, tube station ads, there is little feedback that can be captured.

And even on the internet, how do the new junior marketer learns that google/facebook ads don't have a positive ROI for his use case, assuming he's measuring at all? That's by spending a few million dollars in vain.

Anyway, that is not to say that marketing is useless, it's an important aspect of some businesses. The capital costs involved are fairly high though and can quickly spiral out of control. A big part of the marketing/advertising industry is a scam operating at a loss, an elaborate conduit to transfer money from the client to the advertiser.