I work for a mid-sized financial services company that includes two regional banks. Over my 14 years there, as we've grown we've gone from a fair amount of latitude in taking down systems to highly restricted outage windows, even when everything is redundant & load balanced. It's certainly more challenging and cuts into personal time much more.
I hate that restrictions on uptime and maintenance cut into personal time. I think it's a sign of a good employer when they balance that with other time off.