However, it is advisable to exchange it as in the event of any issues resulting in conviction, a UK Court is more likely to impose a disqualification if the licence held is not one that can be endorsed.
Yes, they can't issue fixed penalties to non-British licences.
But it changes nothing - they can issue fixed penalties (well, technically, on-the-spot fines are deposits towards the fine when it gets heard in court - conveniently, the court will always issue a fine to be equal to the "deposit") in Poland to non-Polish licences, so what the DVLA says means nothing, except confirming that EU licences don't have to be exchanged.