There were a few factors. Galway’s style of football and generally not bringing any great buzz to their two major games Vs Dublin was one of those. That’s one county, can’t blame all the ills of the game when one county is like that.
Tyrone not being able to make more of a contest of it (though they did pretty ok considering) and the fact they still play a very similar system to the 00s and people are tired of it, when they had more brilliant footballers and were beating Kerry people were happy enough with it despite the uglier aspects.
No sign of any other Leinster team really improving is a factor, though to be honest I’ve long ago lost interest in much of the provincial stuff also because of the qualifier system. Ulster had some great contests still but that has declined as the quality hasn’t been as good and the ultra negative tactics became more widespread.
Mayo & Kerry being knocked out/declined/serious injuries for Mayo meant Dublin didn’t have a fierce rival that could push a major game right to the wire, unlike every other year since 2010. That has to be a factor. The loss of Connolly was another.
On the other hand, I personally enjoyed, as I’m sure many others did, the novelty factor of facing the Galway challenge, and having Tyrone in the final. A break from all the hype and nonsense that surrounds championship games Vs Mayo & Kerry year in year out. The brilliance and entertainment of Howard, Mannion, and Fenton with cameos from others such as Scully, Jack, Cossie etc. Jack and the revelation/rediscovery of CK as a top attacking force, in general, were fantastic to see consistently through the year.