On the platform front I believe this philosophy has recently 'won the war': Microsoft was forced to create Windows Subsystem for Linux (WSL) as a compatibility layer to access exactly that rich tool ecosystem and it's server & production oriented workflow... Cross platform means "not windows", even on windows.
Up a few abstraction levels though, and we can see that philosophy dominating in cloud space... "Micro-services" are API enabled single-use tools focused on doing 'one thing well' and yielding coordination responsibility to higher level applications and not assuming as little as possible about their end-use. Tool silos to support new unforeseen use-cases.
Even more emblematic of the Unix philosophy in cloud space is the emergence and growing popularity of "serverless" solutions: hyper focused single-use tools directly integrated into the computing environment. A single function, pumping between cloud services or transforming some text, "freed" from infrastructure.
In days of old we had to build up the foundations -- text manipulation, process stats, diff capabilities -- but based on that amazing ecosystem the new generations of those tools are freed to focus on new problems and speak a more abstract and higher level language -- APIs, event queues, NLP services... Just like how some primates started grunting, and then they grunted numbers, and then they made satellites and then conquered mars with robots. Shoulders of giants, and all that :)
WSL seems to be more about the success of the Linux kernel API than any philosophy.
I would posit(x !) that it's because it is easier to form a community and 'cost of entrance' around a megalith like Kubernetes, than around individual tools that do 1 or a few very similar things well.
Then again, I would say it's time to start looking away from "handling text streams", to something that can handle data streams of various formats, including transcoders that can convert from one type to another.
The original unix utilities had the benefit of (compared to now) being in a relatively simple environment, and a (much more) relatively small developer community, and a clear shared architecture understanding between and among utility and systems designers. They almost end up being more different commands or subsystems of one 'thing' then a 'thing' of their own. This is very hard to do. Unix succeeded because it was succesful at it.
Once, for instance, you say "oh yeah, we want just like this, except not just text streams", as you suggest -- it gets even harder. Especially in today's environment which is not that of the unix origin.