I was just curious why the Designers have the ranger class (a half spell-caster) had less spells known than spell archetypes ie. Arcane Trickster and Eldritch Knight. Both Arcane Trickster and Eldritch Knight end with 13 and have cantrips. Meanwhile, Ranger has 11 at 20 and no cantrips. Since Rangers have more spell slots and have some unique spells, that they would give archetypes more spells.
Is there a quote from the designers anywhere about why they designed it this way?
Best Answer
There are no quotes regarding the number of ranger spells known.
At least, I couldn't find any.
The developers consider spellcasting a key source of the ranger's power
My favorite developer intent article says the following about ranger spells:
...
It's clear that the developers envisioned spells being a core part of a ranger's power, and that specific spells make up most of that power. Thus, for the ranger, it seems that the total number of spells known at level 20 is not correlated to the intended strength of the ranger's spellcasting. Instead, it's the ranger-specific spells that make up the ranger's strength.
Now, that's just the developer intent at the time of the class's creation. The existence of a UA Revised Ranger shows that the developers eventually came to believe that the Ranger in the PHB was too weak:
Which is consistent with the complaint in the question.