The short-rest spell point system is simple.
A full caster gets a number of spell points equal to level + 1. So a level 10 caster has 11 points. A spell costs the same amount of points as its slot value, so a slot 3 Fireball costs 3 points to cast. So a level 10 caster can cast Fireball three times, plus a couple of minor spells, before needing to refresh during a Short Rest. At level 10, the caster can cast 5-point spells but not yet 6-point spells. So alternatively choose to cast two 5-point spells like Telekinesis plus one minor spell, before needing to rest.
Very simple, user-friendly, narratively intuitive, and surprisingly balanced mechanically.
The amount of spell points, level + 1, derives from the value of the Warlock spell slots that no longer exist in the Play Test. But the flexibility of converting these slots into points is valuable. Probably, this same value should work for all full casters, including Wizard, Druid, etcetera. Now that the playtest Warlock is being reunderstood as a partcaster-plus-Invocations, it might need to have a two-thirds spell point pool, such as a Paladin would use.
Anyway, whatever the exact numbers that work best, a short-rest spell point system is great to have in the DMs Guide available for every caster.