it's my understanding that there is no way to view a single address that adds up the total balance from all deterministic addresses in Armory?
Right.Sometimes I'm not available at my computer to know what the balance is on my Armory wallet. Is there a main address in Armory that I can use to check what my balance is? Every time I send btc, there is a new change address, so it's my understanding that there is no way to view a single address that adds up the total balance from all deterministic addresses in Armory?
If you're at another system with an online Armory installation where you could import a watch-only version of your wallet, you can view the address that way. Theoretically, an online service could implement this, but I don't know if any have: it's something of a niche thing IMO, considering how it reduces the privacy that Armory provides.I'd suggest that instead you consider using something like Chrome Remote Desktop to let you access your computer from your phone. This would allow you to easily check the balance.