xFi required for speed upgrade?

I previously had 1.2GB service when working for a prior employer who reimbursed for my internet.   While in between jobs I dropped to 400MB service and, for me, I don't see a whole lot performance difference from my end.  I have a 3P 2.5GB capable modem and router setup (Arris and Orbi).  I'm now onto a new home based job, and while they will not reimburse me for internet, in a weak moment I tried to upgrade my speed to 2GB through my Xfinity web portal.   I would pay something like $35 more a month for the upgrade.... but Xfinity would not let me submit an order unless I clicked a box for xFi (which I completely do not need) and pay supplemental fees.  I spent a 1/2 hour trying to avoid the xFi option and could find no work-around.   Luckily for me, it seems Xfinity does not want to make an extra ~$400 a year from me.