Liam Cahill might have led Tipperary to the inaugural All-Ireland Under 20 final but he's not convinced by the GAA's decision to redraw the underage grades.

Cahill also guided Tipp to the final U-21 All-Ireland title last year, beating Cork, who are again their opponents in a fortnight's time.

Minor switched to U-17 from U-18 for 2018, with the rationale being to take the pressure off students sitting their Leaving Certificate.

However, Cahill told RTÉ Sport that the trend for boys to sit their final exams at a later age means his U-20 panel this season has had as many members doing their final exams as they would have when he was minor manager.

"I think the GAA have got it wrong," he told RTÉ Sport.  "They have moved back the U-17 to facilitate the Leaving Cert and they've just kicked the can further down the road because now we have fellas doing the Leaving at 18 and a half, 19.

"The first round of the championship in early May, we had eight or ten lads doing Leaving Cert, so it was the same scenario (as minor). If that was the reason for moving it back, it definitely isn't working anyway."

A GAA review of development squads and academies is expected to recommend that U-19 become the only inter-county underage grade.

For Cahill, this not the answer either as too many players would fall between the cracks before they were ready for the physical demands of senior hurling.

"I don't know where this is going to stop," he said. "To me, from a pure coaching and development perspective, when you're in a role like myself and Denis Ring (Cork U-20) and other managers that are there at the underage structure for a long time, it's about consistency and developing players gradually.

"Bringing a 19-year-old, the way it's structured now and the way inter-county senior hurling is gone, fellas are nearly 23, 24 before they really establish themselves. So it's a big gap from U-19 up to 23.

Tipperary U20 and senior forward Jake Morris

"The way the whole strength and conditioning side of the game is gone, you're going to lose fellas between 19 and 22 before they actually grasp it. Unless you’re an exceptional player, the likes of a Kyle Hayes or a Peter Casey or a Jake Morris. They are very few now. Limerick were very fortunate last year to push through a couple early but most counties won’t get that.

"They are massive units now playing inter-county hurling. When you’re meeting a fully conditioned Padraic Maher, albeit in his twilight years, when you put in a 19-year-old against him, he has to be an exceptional player to compete."

Cahill, who suggests a return to the previous age grades of U-18 and U-21, or U-19 and U-21, does accept that he has had less competition for players with Liam Sheedy's senior panel this year, given only Morris, Jerome Cahill and Paddy Cadell are involved in both.

"That’s the one plus," he said. "Had the competition remained at U-21, we would have 11 to 12 players on Liam Sheedy’s panel at the moment, and I probably wouldn’t be here in front of you today because, as good as we might look on paper, we wouldn’t have been able to come together collectively to get a competitive environment and a proper team structure in place

"We only have the three guys involved and we have access to 90% or more of our panel throughout the campaign. So that is the one plus I would say that the U-20 grade has contributed."