That's because most devices use constantly varying amounts of power. For example a washing machine might use 1500 watts while heating, 150 watts while spinning, and 5 watts while filling with water. With no storage, you need to have available for it the whole 1500 watts it requires (otherwise the machine will power off). Yet the whole time it's using 5 watts you're wasting 1495 watts.
The vast majority of solar inverters don't even support non-battery non-grid powering of AC devices because of this problem - it ends up being hugely wasteful of solar area.
Near-Storagless off grid setups could be done with small amounts of batteries to even out said peaks and troughs in load. If you want to buy one, they're normally sold as 'hybrid' inverters. Even a tiny battery is enough if you have logic to, for example, turn appliances like fridges, car chargers , or air conditioners off or on based on power availability.
Instead, the laptop power supply will just cut out if it isn't provided with the power it wants to take.