What does Companion / Specters / Minion Size do?

Hello together,

i have a question to which i was unable find a answer.
What does Size do for Companions / Specters / Minions?

I know bigger Companions cost more Spirit then smaller ones.
There is also this support gem (which is btw suuuper expensive on a companion)

"

Enormity
Support, Minion, Persistent
Tier: 3
Level: 1
Reservation Multiplier: 130%
Additional Reservation: 10 Spirit
Support Requirements: +5 Int
Supports Skills which summon Persistent Minions. Supported Minions are larger, have more Life, and deal more Damage, but cost significantly more Spirit.
Minions from Supported Skills have 20% increased size
Minions from Supported Skills deal 20% more Damage
Minions from Supported Skills have 20% more maximum Life

which provides +20% size. But what does this do exactly?

- does it just look cool?
- does he just get stuck more?
- is bigger = more often attacked by enemies?
- does it give him more reach?
- does he move faster because of longer legs?
- do some hidden stats increase?
- are his attacks also 20% bigger?
- does he just block more projectiles from enemies?

i have no clue so the question to the community if somebody knows this or where i can find the answer to this.

Not certain, but maybe affects aoe of corspe explosion?