You pays your money and.....
WWW is a bigot (as exemplified by his... uhmm... 'unfortunate' offensive stereotype 'Florida monkey') with a track record of rubbishing 'foreign' aviation training and that at USA JAA-FTO's in particular.
It is certainly and obviously true that 100 hours would 'train' anyone better than 50 hours, whether in a car, tractor, aircraft etc. Predictably, most people don't have the money or patience to do much more than the minimum required to obtain any licence or rating. Also, there is the practical problem that aircraft availability, weather etc. mean that 'getting it' in the UK usually takes a great deal longer than in the USA. That said, training in the UK will suit plodders and people whose business/job/relationship will not allow them to leave the country for a few weeks. It is, also, necessary for those who save-up for their next weekly lesson and take a year to obtain their PPL.
Going to the USA does involve additional expense of flight, visa etc. but it will be much cheaper overall
Lastly, in response to two more myths:
1. OBA and, presumably, others don't care if you want to take more than however long is allocated to their packages- the time pressure is mainly from the customers rather the FTO's who will happily extend- you only have to pay for accommodation time which is not included in your course package.
2. If you turn-up to rent at Old Farts Flying Club, with a new PPL obtained anywhere else, it won't matter if you are a Welsh wizard, a 'Florida monkey' or an Essex expert, they'll give you a hard time and insist on checking you out, familiarisation, membership etc. etc. before you're accepted.