It's been a few years since Philips Hue removed the widgets from its iPhone app, but back then they weren't on the home screen anyway. Apple now allows widgets on the home screen – and since the launch of iOS 17, they can even be interactive. This means that actions can be performed without having to open the corresponding app.
A few years ago, Apple completely overhauled the notification centre and thus also buried the widgets previously available there. With iOS 15, the widgets moved to the homescreen, but had a big problem there until now: they did not allow any interactions without opening the associated app. Since then, there has been no Philips Hue widget for iPhone and iPad.
Fabian