The big issue is that we can't go much further that way. That's why for instance China industries advance while we regress. Interoperability and diversity are keys to success, cutting them means cutting the branch we are sit on...
These days many developers do not even know how to deploy their apps behind some third party APIs, finding a sysadmin it extremely hard and most are just "homelab guys with a bit of experience", how can we build something with this holes under our own feet?
A stupid example: photovoltaic is now relatively popular and that's clear the sole reasonable usage we have so far is self-consumption, we also have LFP storage still high priced (respect of China) but at a price tag sufficient to buy some storage at home like a giant UPS for a home, that's actually 400V batteries, most common inverters recharge directly from their MPPTs, actually the very same batteries are in most BEV. Well NO DAMN SINGLE VENDOR offer DC-to-DC direct charge for cars, simply nobody have apparently thought of that. We even have a standard https://www.iso.org/standard/77845.html but nobody seems to have implemented it commercially. We have a significant set of IoT appliance, only very few offer at least an open standard protocol for integration and most of them offer only ModBUS as an open standard protocol, something from the '70s, nice for certain usage also today but way too limited for many other possible usage. MQTT is a complicated option, still valid, very few implement it. Two more easy open options exists (Kafka, Matter) but nobody seems to implement them. We have a gazillion of VoIP solution almost no one is really simple and ready to deploy for anyone. Mumble/MurMur are the easiest for voice, but they are just chat, no calling ability, GNU SIPWitch is a lightweight SIP alternative, but it's far from being comfy for SOHO usage and Astersik/Yate are simply too complex for most users, similarly the first voice + screen sharing was in 1968 "The Mother of All Demos" we still lack a broad comfy screen sharing + voice solution, we even lack an IPv6 global per host to ease anything.
Long story short we waste gazillion of resources to maintain immense pile of crap following the classic https://xkcd.com/2347/ creating fragile monsters and struggling to go past this sorry state.