In order to successfully compete with the AAA titles currently out there and being released throughout 2015, full destruction is a must.
If you fire an RPG or a tankshell somewhere it must do more than "BOOOM!", if there is no hole in the wall and with more damage, the house ain't coming down, the game will not please a lot of players.
If I can't cut down bamboo with my M60 to take away hiding spots for the NVA, this will be a dire one. I remember cutting wood with an LMG in Crysis back in 2007.
Same goes for flame weapons which need to burn down the jungle if the player(s) wish to do so.