I think the EU just wants to make leaving it as hard as possible for any other country which might think about it (Poland? Czechia?). Since no-deal supposedly means a hard border between RoI and NI, and the EU is willing to accept no-deal, we have either of the two:All this fuss because the EU is worried that Ireland will get more powerful vacuum cleaners than they have in Brussels?
a) the EU is willing to accept the hard border between RoI and NI
b) the EU can maintain open border between RoI and NI even in the event of a no-deal
If it's a), then the EU's claims of rock-solid solidarity with Ireland are lies . If it's b), then the backstop is not a necessary guarantee of an open border between RoI and NI, so why is the EU insisting on it?
 Or maybe not. Pumice is a type of rock, too.