I think this is common wisdom but that it's wrong.
The best result of negotiations are always two sides who come in wanting to make a mutually beneficial deal and are willing to give and take. There's this conventional idea that ideologues and "hard people" get the best deals but that's just nonsense as many who have been in negotiations will tell you. Those people get told to sit in the corner while the adults work it all out.
This isn't a Hollywood movie. There's no action heroes storming the Champs Elysee to save the day from Europeans trying to rob us of our borders. It's a complex negotiation on trading unions, freedom of movement and customs protocols.
I think the Tories will get us the best deal because I think Labour as a Party aren't equipped to lead at the moment and I don't think the Lib Dems will EVER be equipped to lead. However, May being a firebrand will NOT help in actual negotiations and in fact will harm us. Diplomacy in the real world is patient and long winded.
I agree absolutely about the 'two sides winning' - the negotiations need to be undertaken in a calm manner, building relationships and agreements well away from the glare of public debate, but under appropriate governance - there is no place for action heroes I agree.
Unfortunately that is not the position the EU is coming from - their mandate given to Barnier is a clear EU totally win and UK totally lose scenario - the UK cannot go with that.
We do need to bring to the table a position where we are able to conduct the patient and long-winded discussions because we are not simply forced to accept the EU positions.
The only point I disagree with you on is your comment on May acting as a Firebrand point. May, IMO, has been no kind of Firebrand - she has been utterly boring and making it all very toned down - as you say - this is what is needed.
My point was about Corbyn not May and it was not really with regard 'character' - the PM (Crobyn or May) will be the leader but they will not be actually undertaking the negotiations. I have undertaken major negotiations on behalf of the government and I have always done so by presenting the options and recommendations in front of the leader (and their governance group) at each point - the people that bring forward the options and recommendations will not be front-line politicians.
My point, although I made it sound all about Corbyn, was meant to be more about, from a negotiating preparations perspective, that the last months will have been all about getting our stall agreed and working out how we would conduct the negotiations and what we would actually do at the 'rub points' - even though you want them to be as few as possible. I do not think Corbyn will have made the necessary decisions and will have hampered the UK's negotiating team - just my opinion.
Anyway I have strayed in to the A50 thread content so will leave it there