yeah I think about a decade ago there was like $10-$20 limit in poland per transaction and visa contacted bank during payment every 4-5 taps
not sure how mastercard worked

today I'm not certain about the limits - for sure more than $100 - but is it a hard limit or default to be changed in bank app, I have no idea
don't usually spend more in physical stores

I doubt what he said is right - I wager that (in case of gaming laptops at least) battery just is not capable of supplying 150W or more that is required for full power operation