Sort of, ish. When things actually get copied to the filesystem, if the process crashes or fails during that time, (a) it could cause a state where the system might not be able to boot, and (b) they tend to complain loudly and require manual assistance. This isn't great for embedded or even mass consumer systems.
I'm really glad Linux is finally moving beyond the curse of apt-get. I wrote a framework a long time ago for building distro-neutral binary installer/package hybrids and eventually walked away ... back then Ubuntu was brand new and Shuttleworth was even warm to the idea, but the old guard he had to deal with hated the idea. Other distributors were even worse. They had all bought into the idea that the way Linux managed software was awesome and superior to every other OS, even as new operating systems were designed and shipped that universally did not use it.
The notes are still around afaict: https://wiki.ubuntu.com/AutopackageIntegration
It was written in thousands of lines of bash because back then, I had used some random distro that didn't have Python installed out of the box so I became convinced that only bash would be compatible enough. No clue if that perception was actually right - Python would probably have worked well enough. The GUI was in C/GTK. Some of the binary compatibility tools were an unholy mix of bash, C and assembler :)
closer to...
"changing a fundamental building block needs to solve a user problem" (and there are multiple kinds of users involved). :-)