is there any reason at all why I would care that the Englishman is from Liverpool?
But it was just a curiosity. When we saw a Swedish diplomatic car we knew they must have been speaking Swedish...which made no difference at all. Germans, Swedes, Dutch...or English. Some sort of Europeans in buying warplanes, basically interchangeable from our point of view.
I think when it is just curiosity... anything goes.
Do consider that (regional) language and (regional) culture are interwoven, and not by imported immigrants (Bootstoots) but grown up together since many centuries.
Original it was for me moreover general (insatiable) curiosity in seeing that relation between history, culture, regional language, regional vocubalary from that same language, and sayings etc used.
But when I got involved in dealing with people from all over the Netherlands and later all over the industrial areas of Europe, it mattered a lot that I had a basic understanding of the culture of the people I talked to.
If I take again as example Groningen in the Netherlands, where there were areas with peat, and 19th century workers mining that peat, getting hardly paid, forced to buy food in the shops of the peat field owners.... one of the ways people from Groningen are described is : "they are made from peat, jenever (Dutch gin) and suspiciousness. With as joke: "if you say to someone there that it is a beautiful day, you get as answer back... hey, the day is not yet past !"
If I come from Amsterdam, from Holland, and sitting with a business customer on a table, I start with 0-3 against me compared to a competitor located in Groningen. That's where the small talk is for... to thaw the ice... to show you understand... that you can (also) be trusted. And because my mom came from that area, with family still living in those rural (very backward) small villages, I could drop that. And get talking.
Respect-understanding-shared similarities-communication-trust-deals.
For a tourist it does not matter. When you have to interact and have results, when you need to understand and trust between the lines, it is important.
Most things do not go by highly defined language, contracts, lawyers. Especially not with people not used to that and assuming with their business partners that they share the same context. Most business in for example Germany is small-medium family owned business. It is not as consolidated as the US. If you investigate (business) culture in a country it does matter a lot if you sample people from small business or big business. Only at headquarter level of big business the highly defined culture, more anglosaxon-international culture, has gained ground. If you USians meet people from Europe (not tourism), you meet people already used to that (alien) low context-high definition culture.
Within regions of (continental) Europe understanding culture to get trust is fundamental for success. More so for customer contact as production. Many international companies in B2B have their marketing/selling often split up NOT per country but per area. For example: it makes much more sense to wrap up South Germany (BW-Bavaria) together with Austria-(German speaking)Switzerland etc, than with North Germany.