That’d be a problem if you need to deposit cash, but who does that any more?
Fair enough, lack of cash deposit was a caveat for my very particular set of circumstances, but people should be aware that the very large-looking ATM networks that CUs have doesn't translate to lots of cash deposit ATMs. Even if some of those machines physically accept cash for their owner CU. They specially call it out -- "We only accept cash deposits via select ATMs".
(I was using Citi's free U.S. ATM withdrawals from a Citibank Singapore USD account to move my spending money over slowly; certainly would not do that again now that TransferWise/DBS Remit are decent choices, and now that I know about IBKR.)
That’s a task you can easily accomplish via Internet or mobile banking, but then I think it would count toward the 6 savings account withdrawals per month maximum. Not a big deal, though. It just means you cannot transfer $3.95 every time you buy bread using funds from your checking account. I typically top up an active checking account twice a month, occasionally three times a month. That’s less than six, much less. And it’s certainly possible to have only a checking account if you prefer, including for all deposits, but the savings account earns more interest.
Phone/mobile/internet banking/ACH transfers all count towards the limit. For Alliant CU, the exceptions are ATM transfers, branch teller transactions, and transfers via mail (!). I don't really know why people will run into problems with this limit, but since you pointed out that ATM withdrawals don't count, anyone who actually needs to know that might also find it helpful to know that ATM transfers also don't count.