Disabling manual torpedo drop for T4-5 carriers is in my opinión a very unwise thing to do.
While it will surely please somebody (honestly, even BBs can't get that much punishment on average, given that not many games include CVs and that even if some do, your own BB is by the laws of probability not going to be picked for torps all the time), it will do way more harm than good:
- Playing TBs without manual drop is boring as hell, as the only thing you do is target and approach selection.
- Automatic TB drop is practically useless (and therefore frustrating, on top of being boring) even against slow and clumsy targets provided that they have a minimum of situational awareness.
- CV drivers will have no way to learn to manual-torp until they get to T6, where they will constantly get whacked by strong AA, therefore depriving them of the opportunities to practice. Once you run out of TBs, no more learning..
- Smoke and terrain can render TBs even less useful, as others have already explained. But that only adds insult to injury, as players able to use that to their adavantage will necessarily have developed a certain playing skill, and therefore are not the ones that complain about torp manual drops. They try and fight their way out and when in real trouble, just hope for the best and learn from their mistakes, as all decent players do.
I am adamantly opposed to this change, and, honestly, I just can't figure out how you WG could even just come up with this proposal. But, as you might as well implement it no matter what, I suggest you to at least consider giving T4-5 carriers an additional alternative loadout comprising one fighter squadron and 2-3 bomber squadrons, with no TBs. Just please give us a choice out of this TB nightmare.