^^ Your point 3 seems to largely depend on the school/the experiences of the individual. I did QTS only and did not have such an experience.
I thought I had already posted on this thread, but it appears not! So here goes.
Having taught unqualified in international schools since 2008, I obtained my QTS via assessment-only in the 2013-2014 academic year. I too was able to compile my file in a leisurely manner while undergoing all of the necessary observations, tests etc.
I can fully demonstrate academic rigour through the fact that I also have a master's degree in linguistics. I don't think I necessarily need a PGCE on top in order to show this.
Many international schools will frankly hire you just with a master's degree. While the 'better' ones will arguably restrict themselves to qualified teachers only, QTS is sufficient to fulfil this criterion.
Sadly it is a myth that PGCEs are automatically portable everywhere in the world. My aunt gained her PGCE in 1983 (having completed a degree in French and Italian immediately before this) and taught in schools for 10 years in the UK before becoming a headteacher (she did this for 7 years). However, when she moved to France, local schools refused to hire her because she didn't have French teaching qualifications. Equally, more recently, a French friend of mine who completed her PGCE at Oxford more recently (I think in 2014) found that she had to gain the French teaching qualification on top of this when she returned to France as the PGCE was not accepted. Even though EU law dictates that their qualifications should have been recognised, this is frequently not the case in practice.
In short, even a PGCE is not a guarantee of portability internationally. Pay portability has been abolished anyway (even nationally) as far as I understand it - so in my view you should go into teaching via the route that works for you. For me, a PGCE + NQT year would not have worked as this would have involved me giving up my job and returning to the UK for 2 years. My husband would not have been able to come with me due to the nature of his work, so for me being to gain QTS via assessment-only in my own school was the perfect solution.