I've spent the last 3 days riding on gravel trails on 250 gram tubular tires and 300 gram rims. No issues.

Heavy bikes are a misery. A mountain bike feels like riding a farm tractor after being on a road bike. A hybrid will be halfway as miserable.

Unless your riding involves going over head-sized rocks at high speeds, do not get suspension (including a fork). It just adds useless weight, energy-sapping suspension bob, and loose and dodgy steering.