The comcast outages are far above anything that's 'normal'. And honestly if it was just me, as a decades long 'devops' person, losing network connectivity briefly every few days and for tens of minutes or longer multiple times a month would not be too bad. But my wife does zoom/video professionally all day every day with paying clients, so when comcast goes to crap it's very important for her to be able to reconnect over starlink ASAP.
Have you looked at something like Firewalla and multi-wan setup? https://help.firewalla.com/hc/en-us/articles/360051575473-Fi...
My wife reports that she's able to switch WIFI from Comcast to Starlink in a matter of seconds, which doesn't actually break the video chat session. Not ideal, but not terrible.
When discussing it with some of the sysadmins that I work with, they had a "hmm... interesting" thought with it - the configuration for it compared to the dual wan router setups that they have for their home labs is (from their standpoint) much easier.
The issue isn't so much a "can you do it" but rather a "how much time do you want to invest in designing your own setup?"
Internet scores higher than running water for me on prioritization, but I still couldn't bear to waste the resources to have a sat uplink for the 1-2 days a year comcast goes down. Taking a slot from somebody that actually needs it feels off to me too. It would only likely be worth it if your particular area has abnormally bad comcast uptime.
That said, we just purchased a beautiful rural property with a wonderful house, and will rent it out until starlink or fiber( local company is 1-2 years out) hits it. So maybe I'm just sore that people are taking starlink slots when they absolutely don't need it and its 2 years out =P