The Intel 16” uses a 96W brick, feeding a 45W TDP CPU, and a 50W TGP GPU. But the CPU on my i7 can regularly sit closer to 60-65W when loaded down. Yet, in practice, I don’t really wind up pulling down enough power to discharge the battery while plugged in. If anything, the M1 Max is better suited for the 96W power supply than the 16” MBP was. M1 Max’s GPU has a similar “TGP” to the Radeon chips used previously, and a CPU that caps out at 30W, rather than ~65W.
The expected power consumption should be lower too, if Apple’s battery measurements are to be believed on the 16” version, due to the battery unable to get any larger. But also keep in mind that loads tend to be uneven. Getting perfect 100% load across the GPU and CPU is not very common. So hitting that perfect storm of 30W on CPU and 55W on GPU will not be something you do often, if at all, depending on what apps you use.
The main reason the 16” now comes with a 140W brick is fast charge. Getting a 50% charge in 30 minutes on a 100Wh battery is basically impossible on a 96W brick, even if the device was turned off. You have to account for some losses in the charge.