I think it is better to let them sleep, plants can only use so much light the rest is wasted.
Light bleaching is also a chance.
I keep mine on 18/6
I do seedlings from 0 to 2 weeks, maybe 3, under a 4' t-12 for 24/0. Then they go to a much more intense floro rack, for 18/6 till mature, then they flower under a 400w HPS, obv 12/12.
the sun is around 24/7 heck it's around 36/8 but only the poles know about that business... Just an opinion. I do think that taking care of your plants above and below the soil is beneficial bigger roots bigger buds.. And hey need time in the dark to grow those roots.i dont its not natural the sun isnt around 24 hrs a day. but thats just my opinion