Context is important here: a 20% increase in price to consumer is not going to be perceived as "not dramatically higher". Focusing on tech for a moment, we are discussing this in the context of a good that normally decreases in price annually suddenly getting more expensive.

For the sake of argument, if all goods increase in price by 20%, Americans are going to have the experience of being worse off than they were before.

This is the largest tax hike on Americans in modern times (possibly ever?). While it may take a while for people to understand the impact of policy, people generally do not like large tax hikes. I don't think it's a stretch to think people will not like this tax increase, either.