Oh horse hockey!
It's only 50 miles to Bimini from Fort Lauderdale.
On good days people have crossed on Wave Runners.
The smallest boat I've crossed in and continued on into the Bahamas with was a 24' long outboard powered boat.
Almost every "loop boat" could manage it just fine with a little basic planning and an eye on the weather.
To each their own. But I certainly wouldn't 'advise' someone that 'any boat that can do the loop is capable of a Gulf Stream Crossing'. Those are not necessarily synonymous.