how many bugs could it POSSIBLY have, if its being used probably on a daily basis by whatever amount of people, making levels with it, and i haven't seen anything wrong in the videos/pictures, so if there is bugs, they're obviously very very minor bugs, therefore pretty fit for a public release, and thats why they should release it as a beta, he's completely skipping that stage and trying to release a bug free software, and i bet you once its released it'll probly still have bugs that him and his beta testers didnt find
edit: and oh since Treeki seems to love to keep adding features (i don't know if he still is but from what i gathered before he was pulling a DNF and just trying to fill it with features), everytime he adds a new feature,he probably introduces new bugs, thats usually how that works. So maybe thats why its taking so long. More feature=more bugs=more waiting