I'd be happy to be able to leave the amps at home, or at least be able to go with the 60W combo at ear level as a back up for on stage. Although it's no lighter than a cab, it's just one thing to take. It's not full range, though, and finding something with a coaxial tweeter would be tricky, but other amps are available. In reality if you are relying on house PAs it's a game of aural roulette whether monitors are up to the job and I haven't even used my IEMs in anger let alone persuaded anyone else. If I'm taking my PA and monitors I know I need a bass amp too.
Maybe one day I can leave the amp at home, but it would still require at least a bass, spare bass, effects, spare effects, IEMs, cables, spare cables, spare underwear, toothbrush, inhalers, glasses, other glasses, contact lenses, spare contact lenses, laptop and DMX interface, spare laptop, spare DMX interface, third laptop if using tracks, waterproof keyboard, tablet for remote access to lighting PCs, button controller for lighting laptop, spare power supplies, possibly Proteus, spare Proteus, keyboard, spare keyboard, and a kitchen sink.