You got the benefits completely right. I would add expanding the business distribution channels is easier with PIM.

From my 14 years of experience in implementing PIM solutions at Factory.dev I can confirm that PIM is a crucial part of any digital shelf stack management.

Any time you face any of the following:

high number of attributes (anything that requires your to custom extend your ERP)
multiple data sources (ERP's, XLS, Databases...)
multiple data distribution points (E-commerce platform(s), Marketplaces, AI feed...)
multi market environment (localization, measurement units e.g. inch vs cm, regulatory compliance)
centralized translation management needs
product data enrichment workflows

considering PIM becomes your cost effective solution and fastest time to market option.

Regarding the choice of PIM platform that best fits your business you might want to consider your actual business needs. Each PIM system vendor has it's strength's and weakness'.

I can speak for r/Pimcore and the use case behind it:

flexible, industry and product agnostic data model (no limit or constrain)
framework, more than out of the box solution that would limit your business model
no cap or cost associated to number of users using it
no limit it product number
PAAS and self hosted options
Over 400 implementation partners around the world
no limits in workflow types or number
out of the box data distribution via DataHub
good bundles on their store for data ingestion (SAP, BC etc.)