Things like serverless appeal to businesses due to the much smaller logistical implications it presents to a business. Some businesses enjoy that (at least as promised), It’s all taken care of and the team you need to manage it is likely to be smaller. It’s pay as you go for what would otherwise imply more human beings and contracts on your plate.
I imagine at some point those baked in costs and redundancies, the luxury of having huge scale on demand in a general sense, will be much higher than something thoughtfully designed when a company has understood their needs well enough after operating at scale.
For what it’s worth I prefer bare metal clusters :)