That's why I'm amazed the Remainers MPs and in particular Labour aren't supporting Mrs May. The reasons they give are usually more to do with the future declaration, which may as well be no there for all it's legal standing.
Labour can have all they ask for with the PMs deal.
I saw her plan and backstop described as a period of reflection the other day, where the EU can hold us, akin to a naughty corner, until we realise the error of our ways and ask to be let back out of the corner.
It maintains regulatory alignment, keeps us under EU rules almost certainly until the next General Election and blocks any clean Brexit.