My MBP (16 Max) was constantly hard crashing when using the 140W while I was presenting at a conference. I am not sure if it was the Adapter overloading something or not.
Another presenter packed his 100W charger and when I swapped and used my 100W charger that I had as a backup it worked just fine with no crashes.
I also got...
The Satechi 75W Dual Type-C PD Travel Charger is a game-changer for your USB-C setup, consolidating four separate adapters into one powerful, sleek device. Featuring two USB-C PD ports (60W, 18W) and two extra USB-A ports (total max: 12W) to simultaneously charge USB-C laptops, tablets, and other...
www.amazon.com
For airplane use (although battery life is night and day to my 2015 MBP and it was great not to worry about charging in flight) but just for fun plugged it in and was surprised how quickly it went from 75% to 100% on a 75W charger (Most airplane seats can only handle up to 75W (some airplane seats sadly share that power load with the entire row) and the circuit will trip if you use a higher wattage adapter and run processes on the Mac that fall into the 75W+ range)
I also got....
Faracent Type C Extension Cable, (10FT/3M) USB 3.1 (5gbps) Male to Female Extender Braided Data Cord for iPhone 16 15, Galaxy Tab S22/ S21, 2022 MacBook M3/ MacBook Pro, iPad Pro, Surface and More
www.amazon.com
To extend the length of the Magsafe cable when needed and have not run into any issues with it. I have not had it long enough to see if attaching an extender will slow down fast charge. My guess is yes. I however have been wrong before.
Very long winded way to say yes. Lower wattage power supplies seem to be working fine. If anything I might be running into issues with the 140W and antiquated infrastructure.