Apple Completes Pixelmator Acquisition - MacRumors

Apple could eventually integrate these apps into iOS, iPadOS, and macOS, but for now they remain separate and available from the App Store.

I would be absolutely devastated if Apple folded it into the OS and killed the standalone app. Pixelmator is far too valuable, and important, to get swallowed up and relegated to tiny updates at the margin only once every twelve months.