Software has become more increasingly complicated over time. Aside from adding new features, many companies have improved their efforts of providing accessible applications to a international audiences.
Let's not forget we've drastically increased security by writing applications in safer languages.
Oh, and newer applications tend to support a far wider variety of devices types, displays, inputs, etc.
Developers definitely be investing a lot more effort into improving the status-quo, but it's unfair to claim stuff is slower without improvements.
This tweet is an interesting visual that makes the same point: https://twitter.com/TheoVanGrind/status/888850519564984322