The break even point is fictitious and purely designed to make the employee think the damage is not all that bad.
The break-even point would be a bit more accurate if you could actually leave at that point and claim the pension. Unfortunately, you can't as you will be penalised for every year you go before the NRA. For example, if your break-even pension point is at 56 with a projected pension of £50k, with a NRA of 60, you will lose 6% per year (24%) of that figure if you go at your break-even point, leaving you with around £38k.