I've never understood the notion that US based companies have it easier. They still to pay applicable tax in every country/state that their customers reside.
If anything, EU companies have it slightly easier because they can file all of their EU-based taxes using One Stop Shop.
You can do Non-Union OSS as a US company as well. I’d say the most annoying thing about the EU is their minimum transaction to start filing is very low compared to US Nexus rules.
Why don't they then? I've been trying to tell US merchants they can literally get free EU customers by registering for IOSS and the most I've gotten is a shrug.
Many of us are willing to pay for shipping and taxes up front just so their products don't get caught in the "free money for us" exploitation racket that is EU customs.
If anything, EU companies have it slightly easier because they can file all of their EU-based taxes using One Stop Shop.