USB-C negotiates voltage and current, and current (and thus watts) are supplied on demand. So an oversize charger will always work fine on an undersize accessory. (there's NO risk of "blowing it up" if you try to charge a 60w macbook with a 140w charger)
There are also cases where a larger charger works better. We have some high end windows laptops here running CAD and they are entirely capable of DRAINING the battery WHILE PLUGGED IN because they shipped with lightweight chargers that supply fewer watts than the laptop can use when run hard. We ordered in some larger chargers (and yes, they're beastly bricks) that can keep up with and even charge the battery while CAD is running hard. So, bigger IS better.
I picked up a 140w Anker awhile ago, it's got three USB-C ports with quickcharge, and two USB-3 fast charge ports, with a nice built-in display. (it even came with a 140w USB-C cord) That's all I need to take with me, no matter which accessories I pack. It's so much better than ANY of the generic USB-C bricks they're including with laptops nowadays. I honestly don't WANT to pay more for an additional bundled brick I'm not going to take out of the box.