Do consider the whole team:
OHSU is a multidisciplinary NCI designated Comprehensive Cancer Center that treats over 400 Oral Cancer patients a year. I don't know about Meridian.

Likewise, where I was treated they only had one TOMO machine and it had a few "bad days" that caused a few delays, but only one missed session. Likewise, they could have transferred to a Varian IMRT unit but that was not necessary and the Varian IMRT units seemed just a problematic as the TOMO.

TOMO seems to have inspired a whole new class of ARC IMRT systems - Varian and Novalis RapidArc/SmartArc and Siemens VMAT system are all similar and perhaps equivalent to TOMO (some say perhaps even a bit better and generally much faster!).

So, I doubt anyone who works at a Center with both standard IMRT and ARC IMRT (TOMO, RapidArc, VMAT) would agree that "ARC based" is just a "buzz-word", but both types of systems effectively kill the cancer (perhaps a bit less collateral damage with ARC).

I would think OHSU's well experienced Dosimetry physicist and RO's know what they want to hit, how hard to hit it and have trained and qualified on the TOMO planning system. TOMO sessions are recorded using real time CT scanning so they know exactly what happens and TOMO's adaptive logic can adjust for errors.