The end of an era is looming. With the upcoming Windows 10 Creators Update, that's expected to go into broad release in a few weeks, Microsoft has listed a bunch of programs that are either being removed or deprecated. Paint will be deprecated, with development ceasing on a piece of software that's been a part of Windows since 1985.
Paint is an application that fills a need when you need a tool to quickly do a simple editing or image creation task. I still use it today for cropping and resizing images even though Windows 10 has Paint 3D which can do the same things. But the familiarity of the Paint interface is comfortable and I'm used to it.
Microsoft has released a support document listing the removed and deprecated applications and services. While most are good changes (dropping the "nonsecure security feature" syskey.exe for example) the decisions to end development of Paint severs a link between the most recent Windows build and the very first one.