Hi @Moira thank you for the reply! That is a great explanation.
No issues yet - I have a new client who has plans to scale up to/past 50,000 within a year and ideally in the high 6 figures+ over time. If Shopify Plus is an option to do this then that is great, as they grow into the platform there are options available.
This is exactly what we were looking to know, so we can make a choice based on this information.