It would be nice, and I agree because for my newspapers and another magazine I do get free access to the digital subscription as a print subscriber.
But I recall a related question from a digital subscriber, who wanted access to the subscriptions only area (archives). According to the website, that's not included with a digital subscription:
Please note that digital subscriptions do not include the coverdisc that comes with the magazine, or any covermount gifts. Access to the subscriptions only area is also not available.
IIRC it was answered in the magazine that the publisher doesn't want this. Adding free access the to digital subscriptions, for print subscribers, is probably a problem for the publisher for the same reason.