I agree that I prefer to work in samples, ms and dB, but then I suppose not everyone does.
On the subject of delay for widening purposes though, I find just delaying a leg isn’t ideal. The Haas effect means that the earlier signal is prioritised and the stereo image subjectively shifts, so you then either try and compensate by level or by filtering off lower frequencies from the earlier signal to try and take the energy out of it. This also helps reduce the loss of low end due to phase cancellation for anyone listening in mono (front fills, repeaters, recording or livestream in mono etc.).
If I’m ‘manually’ widening sources when mixing, I’ll create mid+sides channels so that the centre signal can be the earliest signal and provide mono compatibility. And on a digital mixer, you can dea exclusively in Hz, ms, samples and dBFS 🙂