I often wonder how many people are successful in Landscape Architecture with an MLA without a BLA. You may want to put that question out there separately.
Is it like trying to be a military officer without going through basic training? I don’t know, but having been through the rigors of a BLA I can’t imagine doing this without it and I would not think of hiring or partnering up with someone who has not. I’m a one person residential/small commercial LA – it might be different in the big firms.