Centrals.... do you know what the Fundies course is? That there are two variants...one specifically for recreational/single tank diving?
I've noticed that there can be a lot of speculative assumption about DIR/GUE from divers who have no experience in it. Mostly because of 'internet education'. I've not taken the Fundies course myself, but I know a lot of divers who have. Without exception, their base skills are well above average...and their approach/mindset to diving is commendable. Most of those people are in no way 'DIR diehards' or brainwashed into thinking there is only one way to do things.
At the very least, spending a few dives with a high calibre instructor, dedicated to developing your core diving skills is an excellent idea. Using videocam to record and analyise yourself underwater...having that expert critique.... that's awesome. Learning new viewpoints on equipment, procedures and drills - that differ from what 99% learn on their OW courses, with the mainstream agencies... that's awesome too.
GUE and UTD instructors aren't the only people in the world who approach diving in this manner.... but seeking simular instruction from mainstream agency instructors is very hit-and-miss - as the instructional quality and experience of rec instructors is so variable.
All said, a Fundies course is an excellent supplement for any diver. For a potential professional dive guide (DM), it is invaluable.
The Philippines is lucky to have a generally strong GUE community...and the sheer numbers of Manila based divers who utilise BP&W..and/or have taken Fundies is impressive.