100% we do not need one company that makes everything hi there Samsung.
Unfortunately, MBA beancounter/neoliberal extremism aka "throw out everything not the core business" has become the norm... and so, with Covid, Ukraine and Trump's tariff and Iran wars, we got a ton of "single focus" companies that are struggling hard, and with everything deemed "not the core business" including internal IT, cleaning etc. sourced out, many a corporation has become internally enshittified.
I'm not saying infinitely asset-light companies are strictly superior either.
I'm saying there's no silver bullet or free lunch here.
If you look at it from one layer above, capital markets that enable the continuous recycling of corporate structures into smaller or larger as needed are more resilient than those in which company structures are ossified.
Of course not every deal is for the better. But no M&A isn't good either. Speaking as a former Wall St M&A banker.