The news: Bank of Hope will acquire SMBC MANUBANK’s commercial banking unit in an all-cash deal that will create a $21.0 billion Los Angeles-area bank. Bank of Hope is a commercial bank that, in addition to traditional banking, offers specialty services for Japanese businesses operating in the US.

Zoom out: Tokyo-based SMBC’s sale of its commercial banking unit is its largest move yet toward streamlining its US operations. In January, it started to wind down Jenius Bank, its digital-only, separately branded retail division. The Jenius website is live, but customers cannot open new accounts. Jenius Bank was a play for retail deposit and loan growth; in its first year of operations, according to Banking Dive, it held $1 billion in deposits and $900 million in personal loans.

Implications for banks: Bank-led digital-only brands have largely become deposit plays, relying on high-yield savings accounts to attract customers and, in some cases, expanding into credit card or loan products. But if they offer little beyond what the traditional bank’s digital channels already provide, they are redundant.

A more durable use case is treating digital-only banks as testing grounds for new banking infrastructure. Rather than overhauling legacy systems all at once, banks can deploy modern cores in a standalone environment, reducing risk and cost. Even if the direct returns from a digital-only bank are limited, the long-term value lies in upgrading the broader technology stack.