I do think the ruling is dumb but not game breaking and it follows the RAW.
My problem with the Goodberry ruling is that it
doesn't follow the RAW.
Disciple of Life said:
Also starting at first level, your healing spells are more effective. Whenever you use a spell of first level or higher to restore hit points to a creature, the creature regains regains additional hit points equal to 2 + the spell's level.
Goodberry said:
(Duration: Instantaneous) Up to ten berries appear in your hand and are infused with magic for the duration. A creature can use its action to eat one berry. Eating a berry restores 1 hit point, and the berry provides enough nourishment to sustain a creature for one day. The berries lose their potency if they have not been consumed within 24 hours of the casting of this spell.
Disciple of Life adds extra HP when you heal someone with a spell. Goodberry does not heal anyone. It creates berries. (Permanent berries BTW. They're still there after 24 hours, they're just not super-nourishing any more.) The berries are such that creatures than thereafter heal themselves by eating a berry, but you're not healing anyone by casting the spell.
Ridiculous consequence #1: If you interpret "creating a magical object which can do X" as triggering abilities which say that "Y happens when X", then yes, Goodberry becomes strong--but the far bigger problem is that Animate Dead
also creates things, and the Grim Harvest ability would then restore 9 HP (or more) to the necromancer who created a skeleton every time the skeleton kills something. It's not even temp HP, it is actual HP restoration.
That is brokenly good, and that's the precedent Crawford's ruling is setting. (Similar issues could arise with True Polymorph, Conjure Animals, etc.)
Ridiculous consequence #2: Disciple of Life uses the same language as Blessed Healer (also a Life Cleric feature), which restores HP when you cast a spell that restores HP to a creature other than yourself. If Goodberry can trigger Disciple of Life, it can trigger Blessed Healer, which either means that you get the HP when you cast Goodberry (even if you eat all the berries yourself? but that breaks RAW) or every time someone eats a berry, you yourself regain 4 HP (which is just goofy).
Crawford's reading of Disciple of Life is insupportable. Goodberry is not a healing spell and does not trigger Disciple of Life.