Did anyone ever say Yuta and Rui played in Bleague?
Everything has its pros and cons. With that many teams the B league is better off with more imports.
That's why if we want a two-import setup, the PBA need to add more teams.
But still, we don't have enough players who are either too good to be displaced at the 5 (Japeth, CStand, June Mar, Chua, Arana) or who are good enough but can be moved to or play the 4 (Mo, Sangalang, Troy, maybe Erram and Almazan). Neither do we have enough starting-caliber or promising 196cm+ wings like Malonzo, Oftana, Navarro, Arvin, Gabe, and Gray. And not every team has those assets too.
PBA teams (and Philippine teams in general) lack in one or more of the following areas: 196cm+ wings, 199cm+ switchable forwards and bigs, and rim protection. Imports would greatly help solve these problems.
In addition, having Ange Kouame, Terrence Jones, or Prince Ibeh-type foreigners might force developers and coaches to change how they develop 194-201cm young players. Either play wing or 4, or be a backup if you wanna make it big in the PBA.