Mute notifications while you are doing other things

When I am typing a text or iMessage, all notifications are muted. If I stop typing, it stops muting. I like this.

Unfortunately it applies to nothing else, including phone calls and audio and video playback. This is baffling and annoying. I get about 1,000 e-mail messages a day and I need to check them so I need to know that they are coming in, however, if I am watching a short YouTube video, the notification will not only sound, but it will mute the sound of the YouTube video for several seconds, which usually requires me to go back and watch it again, and if I get multiple notifications at the same time, I DEFINITELY have to play it again and sometimes a third time. Since there is no way to predict the notifications, and since it's stupid to have to turn off notifications just to play a 30 second video, this happens a lot. It also happens when I'm on the phone. I will get a phone call, answer it, and then I will get several e-mail notifications. Every notification either mutes my microphone, or it can be heard on the other end of the line, which is interrupting the call. Since I know this can be turned off during text messaging and iMessaging, when I automatically get muted notification while typing, it seems quite logical that you would actually mute it when it INVOLVES AUDIO, like phone calls and YouTube videos. I have been looking all over for an answer to this and the best I get is to turn off notifications or to switch it to vibrate only. That is not a resolution. That's not really even a work around if you can do it for other apps on the phone. It is assuming that you knew you were going to get a call when you very likely did not. That's very poor design. If you can mute it while typing a text, you should be able to mute it for everything else, so to me it is a bug and an extremely annoying one. I still want a notification and need a notification, but I can't be turning off notifications and switching to vibrate only constantly because I will very likely forget to switch back and miss something even more important later. I also can't figure out why more people don't have this issue or why they take the work arounds as an answer. If it can be done for one app, it surely can be done for phone, and probably the audio/video apps because, after all, that would be logical.