mother, fluffy The EU would rather No Deal than change the backstop
It protects the SM and Ireland
WA = exit bill + the EU terms to start negotiating any future trade deal
The UK has had its 2 years of negotiation and the 27 members are not going to reopen all that.
Read the terms of the extension: NO renegotiation of the WA, only the PD
The EU would be idiots to trust the UK without a legally binding backstop
.... and if there is No Deal, then signing up to the backstop and the other main WA terms would be a precondition for any negotiations
So, no minideals and the EU's unilateral No-Deal continuation of flights etc would end when they are ready
The backstop is required even if we went for the softest SM+CU type Brexit,
because otherwise right after Brexit an ERG PM will just run out the time in transition and go for WTO
The reason that Brexiters & the HoC are so opposed to the backstop is precisely because it prevents them from going for a Brexit that would mean a hard border.
Otherwise, they'd have signed up,.
They plan a deal with the US which would require a hard border to protect the SM
That is the purpose of Brexit: a US deal, along with the accompanying transfer of power to the huge multinationals and losing opportunities for the oligarchs