hi there
i am not 100% sure about this but what i believe
here is the problem here
when we hear a song, or a sound which is louder than the one before we believe it to be better, more professional, or whatsoever
and because of this reason everyone aims to be louder so they can sell their products; vst synths, sound-designs, beats, mixing and all that
i have seen people making tutorials on yotube with extreme loudness , difference with sounds and vocal, so as you listening what he say when you hear the extreme big sound come you be like woooow, wtf was that, a specially if you dont have same tools that will make you feel its louder/better
but these are only tricks that has been used
about your question , i use fl studio and i really love it, i dont think there is something wrong with it, however, i believe there are tricks on fl studio to make you believe its louder/better
the limiter on master is set +6 db, to bring everything up to 0 db which makes everything loud and cool and you can have positive experience without even touching the compressors,
learn to use compressors and eq to get close to 0db