I doubt you will get a defined benefit scheme in the private sector, only a defined contribution.
There is no pitfall even if the state pension is slashed - they will simply adjust the pay level up to the accrual rate to take any future changes in the state contributory pension into account.
The plus for a PS pension is that it is a Defined Benefit and if the benefit promised is up to a max of 40/80ths (based on the new way to calculated that), then this is what you have to get - this is why they are no longer (or as far as I can see) available in the Private Sector.
The new scheme calculates your contributions on an ongoing basis, your "minimum pension age" is now linked to the State Contributory Pension age - that is the age at which you can retire and claim your pension - this is an area of confusion because some people thought that this was always the case - it wasn't.
If you are entering the PS now then you cannot retire at 65 and receive your benefits - you must wait until you are eligible for the SCP - which is why it is called a "Single Pension" scheme.
http://www.per.gov.ie/en/single-scheme/
- "minimum pension age for most members is linked to the State Pension age (66 years at present, rising to 67 in 2021 and 68 in 2028)"
"Most" relates to "normal " Civil Servants, Prison Officers, for example must retire at 60 and contrary to belief, this is their "Minimum pension age" - i.e the age at which benefits become payable.
Edit - Are you in a Defined Benefit of Defined Contribution scheme?