Went and did up that chart anyway - may as well while we wait for the draws tomorrow.
https://i0.wp.com/stbenilduschessclu...hart.png?ssl=1
So yeah, the gap between first and second in each of the last seven seasons has surpassed every season from 2000-2014 except for two (2007, which only equalled the lowest gap in the last seven years, and 2008, which was an anomalously large romp to the title from Bohs). Similarly, the gap between first and third in each of the last five seasons has been bigger than every season from 2000-2016.
2020 was only half a season of course, yet the gaps are consistent with the other seasons around then.
This year is shaping up to be a bit tighter (around 10 points to each, based on a points-per-game calculation off current standings), though I think Rovers finished strongly the last couple of seasons, helped by more strength in depth, and that may end up being the case again this year.
Anyways, it does suggest that even if Dundalk/Rovers are a match for previous champions, the chasing pack isn't what it used to be.