You can't increase gen speeds or fix gen rushing without also fixing camping and tunneling vice-vers
Say what you want about these strategies but they are direct opposite of each others and are used as a way to help gain momentum to their side. These strategies counter each other. Because they are basically two side of the same coin. together that they even help perpetuate an unfun cycle (Ie killers tunnel and camp so survivor feel they need to gen rush and then killers need to continue camping and tunneling because of said gen rushing and etc etc)
I see people suggest that they should increase gen speeds or add second objectives to prevent gen rushing but again because these two strategies counter each other fixing one without the other would create a massive imbalance for one side. For example say that gen rushing was made impossible for the survivors to do. The killer basically have no repercussions for camping and tunneling and can easily implore on the the two strategies to take a survivor out of the game and get massive pressure that makes coming back nearly important. Similarly if camping and tunneling is solved but gen rushing is still a thing the killer would not be able to gain any momentum to help counter the gen rush thus making the game unbalanced towards the survivor side.
Furthermore the issues of prevalent meta perks like DS and BT and ruin undying is only made more annoying because of gen rushing and camping and tunneling. Since these perks are used to counter these strategies. They are ultimately band aid fixes to the problem and could easily be dealt with if BOTH of these strategies are handled.
It's an unfortunate truth but because of this we can't make any sorta change to either unfun strategy without dealing with both.