>>107117198 (OP)
Well, the biggest one is that the Software is getting so complex and corps are using less staff, so the code made is overall worse. That's not saying anything about the people actually doing the coiding. All the whiz kid programmers are old, dying, or retired, and in thier wake are H1bs, College Kids who went to memecode classes, and brogrammers. Whereas back in the 80s you'd have people working for companies like Wordperfect, coding masterpieces of software in assembly and C.
Overall, more programmers are using libraries for functions, and using worse technologies for things like the installer. So while a good programmer would have a windows release with an MSI that had lots of options for unattended install, a lazy set of developers would use electron because they don't fucking care about admins.
More programmers are using higher level languages, whereas in the past it was stuff like C or assembly. Now we have programs with python, which is 75x less efficient than other languages, so if you have a program doing something CPU intensive, it's less efficient than say, if that portion of the program were written in optimized C or even assembly.