Digital will is a loose term used in two quite different ways, and the ambiguity causes real confusion. Sometimes it means a conventional will prepared online; sometimes it means a separate set of instructions dealing specifically with digital property. The second sense is the more common one and the more useful.
Understood as digital asset instructions, it is a companion to your will rather than a substitute for it. It records what digital property exists, where it lives, who should receive it, and what should happen to accounts that hold no financial value but matter personally. It is the inventory a conventional will has no natural place for.
Understood as an electronically signed will, the picture is unsettled. Some states have adopted frameworks permitting electronic wills under defined conditions; many have not, and the requirements differ where they exist. Whether a will signed entirely electronically is valid depends on your state, so this is not a question to answer from a general article.
The dependable approach is to keep the legal instrument conventional — executed to your state's requirements — while maintaining digital asset instructions alongside it. That way the enforceable document is unquestionably valid, and the practical detail that makes it usable lives somewhere it can be updated as accounts and credentials change.