Nominally larger range for nominally slower ships is understandable, but the relationship is very warped towards larger range, at least for fleet on fleet action. Non- Safety Override frigates will have to take about 10 seconds of being within capital ship weapon range before getting into range themselves. Sometimes they will even get destroyed on the way out. AI frigates which can't dodge shots, or otherwise have some sort of special ability to otherwise mitigate damage, or suicide into capitals, be obsolete when facing capital ships. The range increase is excessive.
It's not really a problem in that most of the slower ships have lower burn speed, so they are more CP efficient to compensate as long as you don't see a problem that eventually all player fleets will most likely be either "fast enough" or "powerful enough" with nothing in between.
It doesn't help that fleet cap is based on fleet size, not deployment size, so you will naturally gravitate towards capital ships. For instance I rather like to collect the Shepherd in my fleet, but with a 30 ship limit it means that there is only a limited amount of slots to take per battle cap, and I suspect the problem would be even worse for those with large battle size.