I have no idea what launcher is
Why would I need access to file system?
You have the choice of how you manage your files. For instance, let's say you have notes, Word Documents, PDF's, pictures, sound file, etc. all related to say the same project. You can choose to put them all in the same folder. Then when you want to send your project, just select the folder and send everything.
another thing that bothers me big time, why cant I block a call , create a blacklist etc I believe it's a built in feature on some androids
That is nice for spam callers. I have used it a number of times for this purpose.
Here are some other features I like on my Android:
One thing that I do is when I go to bed, I like to turn off notification sounds (from email and text messages, for example) while leaving my ringer and alarm on. With Android, I can do this with a single tap on my home screen. I have a widget for this. When I wake up, I tap the widget again to turn on my notification sounds.
Android also has multiple phones and form factors available. I personally prefer landscape keyboard sliders. Although they are getting rarer now, my last phone was one.
By default my phone has an app dock at the bottom of my home screen. When I page between home screens, the dock remains in place. I don't like that. Instead, I installed a new launcher that allows me to remove this dock of icons. I have an extra row of icons as I prefer it over the dock. My home screen actually has 6 rows of icons by 4 columns. I have the option of increasing it up to 7 x 7 if I choose.
I also installed a different on screen keyboard. I don't like the default one. I installed one where the portrait keyboard keys are bigger, so it makes it easier for me to type. My landscape keyboard is also customised. I have a layout where it resembles the iPad split keyboard. I have a 4.8" phone and find that hitting keys in the middle of the keyboard is cumbersome. My landscape layout is split so the keys are closer to the edges and makes it easier for me to type. The keyboard I use (Thumb Keyboard) also has a number of features I like, namely turning off auto-spacing (that other keyboards I tried cannot do).