@cbrngr  I'm surprised those systems support drawing any power over USB-C at all.  But if it works, you're not going to damage anything.  But you will likely see performance throttling.  Might not be so bad if it's just CPU load rather than GPU load, but you might find that the CPU will throttle performance rather than draining the battery even on AC power in order to make up the power shortfall to maintain max performance.

Same idea with those other power adapters.  You're not going to damage anything (at least as long as you use official Dell adapters), but I'm not sure how well it will work at all, and even if it does work, the experience you have may or may not be good enough to count as "working" for you.

Could he also cause a brownout inside his computer @jphughan?

I heard if you don’t give the laptop enough power even if the battery isn’t discharging.

@Alienware Area-51 ALX 2006  I've never heard of a Dell laptop experiencing a brownout due to an undersized power adapter.  The system can obviously function entirely on the battery, and it can tolerate sudden removals of the power adapter without any problems, so I don't see how having an undersized power adapter continuously attached would create a problem.  I suppose if the battery was completely drained and the system couldn't reduce its power consumption to within the limits of the attached power adapter, you might have a problem, but that doesn't seem like a particularly frequent condition unless the system significantly drains its battery even under typical use while connected to the power adapter the OP is considering.

Your second sentence appears to be only halfway complete.

Thanks for the answer