The problem I see are big companies with several products trying to break down silos between the products to share some infrastructure (be it code, libs, actual

The problem I see are big companies with several products trying to break down silos between the products to share some infrastructure (be it code, libs, actual cloud infra, support teams, design systems etc) when there is very little overlap between the different products. All in some grand hope of reducing costs by sharing things. It almost always ends with overly generic solutions that are harder to use, takes more people to support, can't be fitted well in most cases and that everyone involved hates (causing employee attrition). This is different from having cohesive architecture within a single product.