when you're a mage you need definite powerspikes, the issue is none of these items give powerspikes or increase your kill potential by a meaningful amount. not even ludens echo does that.
the gains are so small and the items give such widespread stats instead of focusing in on one specific area or stat that it is becoming increasingly difficult for mages to accomplish a given task.
they're essentially removing burst. they're giving up on safe wave clear, forcing people to stay in lane longer and they outright want to prevent long sieges. no regen is a must, people have to eventually go oom so the game can end. riot doesn't want mages to have level 6 kill pressure, not without it being an absurd lead.
remember the turret changes? increased speed so minions die faster when they're up against a turret? remember no more alacrity/homeguards? riot doesn't want you to leave lane or get back to lane to catch those cs, you miss em they're gone. removal of green wards... well you better have your jungler granting you vision or you're going to die to some assassin on the way. oh im sorry ignite damage was lowered, he got away with his support now, you had to flash to secure it, landing just your stun and ult wasn't enough anymore. no more needlessly large rod rush = BYEBYE minion wave. no more 5% ap on autos, harder to last hit. lower ap builds = less damage to turrets, better ask your adc to rotate if you want a turret in 1 push.
its all an overwhelming amount of bull designed to change mages away from raw ap and instead lean them towards cdr, mechanics and outplay just like assassins. needing skill and multiple skill shots instead of general game knowledge, positioning, and understanding your champions power.
dont look to your mid laner for damage, protect your kog maw or caitlyn instead if you want to kill something. cuz when bjergsen lands his stun and presses R on you its over in an instant, thats not fun, people want #vayne outplay Mechanix.
TLDR I just want higher squishier AP options than all the items we currently have, they just dont meet my needs anymore.