I agree that the rake length should be increased. Just pointing out some issues here.
The platform length increase was not implemented rigorously. Many of the major stations have long platforms, but the platform length has not been standardized across all stations. So you may have some stations on the route having long platforms, while most of the medium/small stations don't. This won't be a problem if it's only a few trains having longer rakes, but it will be a problem if longer rakes become the norm.
Moreover, just having a long platform...
more... doesn't mean much. The signalling, fouling points etc also have to be moved so that the full platform can be used.
For example, one of the platforms at Secunderabad (SC), I believe it is PF3 or PF4, is long enough to hold 24 coach rakes. But the points (where the track merges with the other tracks) are too close to one end of the platform. So, some space at the end of the platform is useless, as there is a safety margin to be followed here. Because of this, the platform can only hold shorter rakes, despite being long enough. ( I don't know if this has been rectified now)
Similar issues may be present at most stations that seemingly have long platforms. This restricts the number of platforms that can be used for such long rakes, making things difficult for the controllers.
Again, not an unsolvable problem, but not a simple one to fix either, as it will require yard modifications at many places.