Yes, for the most part these drones have universal software that can adapt to the environment in which they fly like FCC/CE. Therefore you don't need to buy an FCC drone to fly in an FCC airspace. There may be exceptions but DJI has done a good...
You couldn't fly in some situations because you were aware that your drone with the extended flight batteries were just over the weight limit or the DJI Fly app prevented you from flying?
Did you see signs of enforcement, like police or other...
I just returned from a month in Scotland with a Mini 4 Pro. Be aware that "Europe" includes the United Kingdom and the European Union, each with their own set of drone regulations. The EU member countries abide by their common European Union...
They are selling with tacit approval from DJI so call it what you want. B&H is my favorite but Adorama is doing a bang up job IMO by coming thru for Americans during trying times. Won't be forgotten. :)