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Phil Schiller stated in the presentation that the new LG USB-C monitors provide enough power with 60W to charge the new 15" Macbook Pro models.

The charger offers 87W because it is meant to be able to provide enough power to charge the battery while the CPU/GPU/external devices run at 100%.

The worst you are going to experience with 60W while everything is running at 100% is that the battery isn't charging or charging very slow.

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I have my MBPr (2013) running fine with a MB 60W Magsafe charger for overnight charging (think it's from my 2008 unibody MB). Been this way for 2 years, no problems.

If you're charging it overnight, you probably won't notice, but it does charge more slowly.

If you're running on the dedicated GPU with high load, a smaller adapter might not have enough power to charge the battery at all.

Yeah. You will notice that if the battery is dead flat it won't let you turn the laptop on for a bit with a 60W charger but with the 85W or whatever it is it will power up immediately.

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