You deliver zero arguments for this. Why would it not make sense? Because every campaign needs to be a farmboy killing boars for 5 sessions before they can have fun?
If you wanna a low level campaign, yes. But escaping a mindflayer spellhammer ship should't be a lv 1 adventure.
Do you know that Conjure Animals is a 3rd lvl spell? Now think about why its not there for PCs yet.
I din't talked about conjure animals, but summon monster
https://www.5esrd.com/spellcasting/3pp-spells/spells-schwalb-entertainment-llc/summon-monster/
