while 18.000 range sniper builds are not possible anymore for DE with their new stance (still possible for corsairs), the changes ignore the more pressing problem of insane level of burst damage eldar torpedo boats currently have compared to their price.
the craftworld torpedo cruisers have 8x90 burst damage at the moment for only 220/228 points. DE have 6x90 for 207 points and only the corsairs have more reasonable numbers with 4x90 for 171 points (the corsair LC with 4 tubes lacks the macros to be viable). all these ships have 24-28dps macros too.
eldar torpedos ignore armor and have a higher dodge, it does not take much experience to kill 1-2 ships per fleet-wide charge. there are not many counter options. if you try to mass turrets, you are wide open for maelstroms/dark matter cannon. if you go heavy on ordnance, you lack the dps/hull per fleet to keep up with the eldar macro damage output. both option work not very well against point-blank torpedos anyway. escort swarms can avoid the torpedos, but have a host of other problems.
like I wrote before, a price increase per torpedo tube should be considered.