Why do you keep bringing up other games as if it has anything to do with Splatoon?
I don't care about Bloodborne. You can use PS Party chat if you want to chat with friends, that is a feature that would benefit the Wii U greatly. Bloodborne's co-op functionality is designed in a different way that isn't even necessary, it's a game that can be played entirely on your own. I wouldn't say the same could be said for a team based shooter like Splatoon, surely the best way to experience such a game would be online.
You're constantly diverting attention from this game as if it somehow makes Splatoon a better game. Splatoon isn't going to be perfect and you're going to have to accept that PlayStation games lacking voice chat wont change that. If a game like Team Fortress 2, CS, Overwatch or even Destiny lacked voice chat you bet I'll criticise how stupid a decision that would be.
People like to do this false equivalence thing with this issue...
"Splatoon is a team-based tactical shooter. Other team-based tactical shooters I've played benefit from voice chat. Therefore Splatoon would benefit from voice chat."
But it's not so simple. Splatoon is a very different game to anything we've seen before. It's such a quick game. Iteration time is very low with the super jump; you can get straight back into the action. You can easily see everything that's happening on the map just by looking down to the gamepad. You don't need somebody yelling at you to get over there, you can look at the map and see for yourself where things are happening and go there. You say voice chat could be used to call for help when something unexpected happens... Two things: 1, there are predetermined signals in the game, used by pressing up/down on the dpad. You can change these messages somehow, and I'd be surprised if there wasn't some way to signal for help. 2, If something unexpected happens, you're basically dead. It only takes a few shots to splatter a player, and if you're caught off-guard, it's likely you'll end up dead. There's just no time to react. Nobody could come in time to help you.
Splatoon is a game where every player has all the information possible at all times. Other than if an enemy is hiding in their ink, or around a corner, you see everything either on the TV or on the map. The only thing determining the outcome of the match is the strategic and twitch skills of each individual player.
Of course, this is assuming most players will be competent. If there's a lot of baddies, then yes, a simple "Hey stupid, standing there doing nothing won't help." might do some good, but then they're a lost cause anyway...
EDIT: I had an idea the other day... What if Nintendo charged a monthly fee for voice chat in Splatoon? People would probably flip out. Even though they do it for Xbox One and PS4. lol
That's not a false equivalence though... It's a team-based shooter. TEAM BASED.
You're acting like this is some entirely new genre when it's really not. Do you honestly believe that it would not benefit from more communication options? How can you honestly claim this?
You can see everything going on the map but you can't read the players on your team's minds. You claim this is about the skills of the individual player but this is a team based game, with proper communication you can strategise together rather than simply call for help or whatever else the limited preset communication options offer you.
There's a game called Awesomenauts that I've been playing a bit of on PC lately. It's a team based MOBA like game so communication is important but I don't think there is a way to use voice chat through the game itself so it's up to text and presets which limits communication considerably. Sure you can use the presets to ask for help, tell your team to attack or defend or even taunt the enemy team but you can't properly communicate and strategise without stopping to type it out by which time it might be too late to tell them your plan.
I honestly cannot see how any team based game would suffer from featuring a voice communication option. Especially with Splatoon offering ranked leaderboards, why bother taking that seriously when the Wii U system itself or the game don't allow you to properly communicate with your team? You're only encouraging Nintendo to stay where they are when they should be improving, don't you find it insulting to be treated like the child Nintendo assumes you are? Parental options aren't hard to implement and Nintendo has experience with them already, there is just no excuse or justification or false equivalence here.
Of course they'd flip out if Nintendo charged a monthly fee for their online features since it's a step in the wrong direction for Nintendo, it's beyond me why people pay for the Xbox One and PS4 services let alone the consoles themselves.