For some customers, it is definitely a game changer.
This is the official public announcemnt of the change:
System improvements - over the coming weeks, we’re excited to bring through a variety of system improvements. First up is an improvement to our latency and reliability of our web portals, meaning faster loading speeds in Self-Serve and fewer occasions of activation issues related to timing out. We’re also doing some fat trimming and are saying goodbye to our build your own plan calculator. While we love the flexibility of our plan calculator, the tradeoff is the ability to reduce pressure on our systems, help the general upkeep of our portals, and simplify the plan purchasing experience for customers. We know some plans can only be accessed via the plan calculator today, we plan (pun intended 
) to bring some of those options back in the near future! Lastly, as you're likely aware, we transitioned to refer-a-friend codes a few weeks ago to better protect your privacy and make referring easy
