But again, logic fail.
Supposed a 60W output portable charger did exist, it would simply drain itself faster, so in the scenario you described of a laptop was not being kept charged by a portable charger, all that would happen is the portable charger is drained earlier, then your fully charged laptop begins draining earlier. If everything was the same efficiency then the moment of laptop drained is the same.
So it remains the case it’s still total energy consumed of the laptop is the same, but with a faster output portable charger you just changed the shape of the curve. But as stepping up the Wattage will be necessarily less efficient, you made your situation worse. If you were to benchmark a 60W portable charger with a laptop and the time it took for laptop and portable charger to be drained, it would be earlier than a 30W or 45W portable charger. Not very smart when you think about it…
So the only actually important thing is not the output wattage of the portable charger, but it’s input recharge wattage.
There are situations where a higher wattage output portable charger makes some sense is when you’re near a wall socket but too distant to plug in, then you’re swapping the portable charger between your laptop and the wall charger, bit again it’s the recharge wattage is still the most important. It also matters if the output Wattage of a portable charger is too low it simply is it ignored by the laptop.
The most important technology are the existence of multiple port chargers and the recharge time of laptops and portable chargers. When factoring efficiency it’s just a machismo thing of more wattage output portable charger.