I think you are commenting on the subject that you are not familar with. As
@Radonsider mentioned, don't you consider F-35 as a 5th gen fighter aircraft? F-35 isn't a 'true supercruising' aircraft even though the fighter jet is equppied with more powerful F135. Supercruising is not an essential feature of 5th gen combat aircraft.
Even then, supercruising isn't about the engine being 'too weak'. It is about design. Gripen E/F has reportedly achieved supercrusing with F414 and Rafale did too with twin-engine configuration of M88. Both engines have lower dry & max. thrust than F110 and there was no aircraft equipped with F414 could do a supercruising before Gripen E/F.