I’m not sure it’s a single thing TJ, but probably the culmination of various issues…
The premiership is often pretty attritional.
No one seems to want to contest the breakdown the way the the Pro 14 and Top 14 do.
Relegation means that there’s no let up and a few poor results and you can easily find yourself scrapping at the foot of the table.
I’m not sure we have enough talent to support 12 teams which means the best players are spread thin (compare the way the IRFU have an input into who plays for who).
Sone of the coaches are shit.
The academy players don’t seem to be as trusted as say those from Leinster are.
Signing big names is often seen as a quick fix, some of whom haven’t lived up to the hype (e.g. Sopoaga, Shields etc).
Some of the rugby coached is shit and is very formulaic.
The best players often get flogged mercilessly (Itoje, Mako, Billy, Cole etc). The clubs don’t care about international rugby, they just want the most out of their signings.
The breakdown….again! It’s one of my biggest frustrations and always causes issues at European and international level.