In the bygone era batting was an art that required solid technique, temperament, and talent (good hand-eye coordination). It also required bravery because pads, helmets, gloves etc. were not really top notch & didn't provide protection that'd make a batter feel comfortable. Coming to the point, the gulli danda format has changed all of that, the pitches are dead, the outfield often wet so the ball just skids on, boundaries short, batters strong, & bats built in a manner that they'd reflect cosmic objects back to another galaxy by a mere touch.
The moment there's swing, seam, or an abrasive pitch that results in reverse swing, the modern batter fails to score anything substantial. Put Finn Allen or Fraser McGurk against reverse swing or any kind of lateral movement & they'd appear lost, give them a bat on a 55 meter boundary when there's dew all around & they'd make batting look as if it's stick cricket 2k3.
That is why 300 is still a decent total on any pitch that isn't super flat or conditions that slightly favor bowlers. However, this won't last long as we will see more 400 totals soon as gulli danda revolutionaries like Gayle Warner etc. will reach management positions (since they've retired). McCullum is already changing/revolutionizing test cricket with Bazball so enjoy this slow cricket while it lasts.
