Radiators may take more or less of the heated water flow than they need. Consequently they will be hotter or cooler with higher or lower outputs compared to the design (if any).
However with TRVs fitted to most rads it doesn't matter so much since the TRV on an "overheating" rad will shut down sooner, thus diverting the flow to other less favoured rads.
Basically, if your system is delivering the heat where it's wanted, you don't need to worry about balancing. However if some rads aren't delivering the heat required then balancing may be required.
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