#2 Name Recognition

The Hardcore Championship may have been silly for its no disqualification rules, being on the line all the time, and preponderance of title changes.
However, for Attitude Era WWE fans—many of whom did not stick around for very long once that period in WWE programming was over—it stands the test of time as a fun novelty. WWE could cash in on that dynamic were it to have brought back the Hardcore Championship, by sparking the curiosity of past fans.
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Particularly with the savvy use of social media—already rumored to be a part of how the 24/7 title will be uniquely marketed—WWE could attract the eyes of people who hadn’t watched wrestling for years at this point.
Hardcore is also an established, known wrestling style that does cater to a body of fans. 24/7 implies the all hours of all days quality of the title, which is a big part of its appeal, but in pigeon holing the name, invites fans of yesteryear to reject it as something new that’s not as good as the old idea it is clearly riffing off of.