The £30k was her final salary, not her pension. If you read further down that post, you will see that I specified that the pension itself was around £15k, THEN she had to share half of that with her ex leaving her with £7.5k.
Regarding the tax being deferred, which I agree applies to both pension types, if you can take 25% of your pension tax free as a lump sum surely that makes a difference to the overall tax paid? You haven't paid your 20% (or whatever rate) on the contributions, then you get 25% paid without having to pay tax on it.
My statement regarding compounding interest and growth related to DC pensions, to try and show a comparison with what the true cost of having a pension pot of that sort of size should be to the employee. So not this £40k pa saved you suggest, more like £7.5k pa. The OP states "public service pensions" and doesn't specify central government, unfunded pensions. In the case of central government DB pensions, it really isn't the employee's fault that the government runs pensions the way they do, yet here we have people suggesting that they get the pension cut. For the majority of public service DB pensions these days, they are funded the same as DC pensions.
The main take away from this thread is that the central government unfunded DB pensions, which are no more generous in terms of the salary (whether final or career average) multiplied by years of service than funded DB pensions, are a compensation for the significantly lower salaries the civil servants receive.
I do understand rather well the principles of the schemes, though not up to speed on very recent changes, but you seem to be trying to catch me out & picking & choosing statements and taking them out of context (and missing qualifiers too). Rather than going into full technical details here, I've tried to write things in a way that people not versed in pensions may understand.
You do seem a little fixed on comparing things to the annuity rates. Comparatively few pensions are now used to purchase an annuity though it's an option that any IFA should consider (and usually rejects, depending on individual circumstances). It was a heinous rule that DC pensions needed to be used to purchase an annuity, and a major blessing when that was stopped.
And of course I never advised anyone directly regarding their pension, I am not qualified to give advice.