Falaq etc. had to be airlifted to Syria. Shipping is possible just very slow and risky (Red Sea and Suez transit) whereas Borkans can be assembled in country using Grads. Airlifting enough Falaqs to be useful was probably regarded as insufficiently high priority compared to other materiel like BM-14 clones.
The Tiger Forces artillery seems quite flexible but they keep it simple. Often you will see a number of systems co-located and these are often elements from different units that have massed up for a tasking. Ultimately, they understand that the purpose is the same, even if the individual tools are different and seem to be able to happily cross support using dissimilar kit. They are probably the most seasoned of the Tiger Forces and would be a fascinating post-conflict debrief. If you look at their 'suggested' ORBATs, they do not really conform to NATO and WarPac norms in most ways, really more resembling the battlegroups in North Africa (unsurprisingly).
The assumption is that all Syrians suck dog balls. I do not believe this is the case given their situation. The Tiger Forces in particular have shown a degree of combat capability substantially better than other units. Yes, they are relatively well armed and equipped but not much better than the Republican Guard or 4th MechDiv. Indeed you see a lot of their equipment is beat up and may be considered inferior (BMP-1s vis 2). They clearly have good leadership and staff, otherwise they would not be able to run around as a fire brigade but they also have an effective training and replacement cadre.
Militaries wishing to maximize their return on investment would do well to study the lessons paid for so expensively in blood and treasure by others. If you see someone that says that NATO has nothing to learn from the Syrian conflict, I can only heartily recommend him or her to be SACEUR.