I am limited by my old trusted nokia 5830 and cannot post videos and links.
But any of you can search for George Bush's 'small nuke' program.
That debunks many peoples claim that world has abandoned tactical nukes,even Russia is persuing this.
During cold war USSR and USA had a missile control treaty in which thet banned SRBM and probably Tactical nukes too...thats why these type of weapons were decommissuoned.
But now very much in vogue as large nuclear weapons lose most of their energy in digging crater and mushroom cloud..
Same amount of fissile material can be distributed into many smaller nukes and effectiveness will increase many folds.
About countries putting all nuclear deterrants in submarines..
That only happened after the end of cold war...during cold war,land based nuclear weapons were kept all along.
So by keeping land based small tactical weapins Pakisran us following a time tested and effective strategy..
Not an obsolete doctrine..