You have a point somewhat although France and Spain would always have massive leverage in the next phase, with or without a backstop. EU countries have been pretty soft towards the UK so far contrary to the British press. This exit agreement is supposed to be the easy bit !
The biggest mistake of course was activating Article 50 prior to having a solid position. Now the much pilloried ECJ have thrown the UK govt a big bone saying it can be withdrawn.
The UK should start looking at Norway plus or second referendum , I think a hard brexit would be a huge folly when the majority are against it . Probably time to ditch May’s govt already she is just delaying the inevitable .
Her one excellent attribute , perseverance, is actually playing into hard brexiters hands as she continues to run out the clock!