> I don't bring my phone or smartwatch, I don't track my time or progress, I don't set targets, I don't care anymore.

I'm jealous of this "Forrest Gump" mindset...I also run to maintain/lose weight, so I use my watch (plus intuition, as mentioned) to manage my pace/heart rate/effort so I can run a long enough distance to burn enough calories.

Although I also realize and acknowledge all these stats are probably at least 50% there to satisfy my caveman need for external validation.