2.15. Method chaining in class design MUST be avoided #443

Could you please clarify the requirement 2.15 of the Technical Guidelines "Method chaining in class design MUST be avoided"?
We have like real holy war here b/c of this rule.
It seems to me that according to CQRS principle that only means we must not use "return $this" while designing new classes.
And that does not mean we can't use constructions like $this->storeManager->getStore()->getId() in our code.
Is that correct?
Or ->getStore()->getId() is also prohibited by this rule? And so we must first get store into some variable. And then get Id using the variable.
Thank you in advance.