This is my Experience on an Instant craft Server (yeah,dumb me that im not playing on official,but i like Server with less ppl).
5 Guys from China (since the release its many many many many player from Asia) coming up to the Server.
Only 2 hours later,my 6x6 house about 4 Floors and the Barricades and Spikes in front of it was bombed.No doors,only a few walls and completely raided.
Yes,its an instant server so i cant say something to the Craft time.But the Option that C4 is not craftable would be the best in my oppinion.
C4 is very easy to craft.The material (if 5 guys are farming) are in less than 10 minutes farmed and it is enough stuff to build about 30-40 C4,which is enough to raid every house.
I sitting in the second floor to wait for a good moment to rush out.2 guys stand in front of the door and save it,the rest farmed stuff for C4.
So,i agree with the Option to make C4 not craftable.
I agree, people complain that Explosives are sooooooooooo hard to make.. But they really arent. If you have alot of Sulfur (you will have alot of charcoal aswell since furnace creates a shitton) you can just fucking choo choo train the Explosive Charges. If you have spent enough time killing animals and mining (atleast 1 hour) you could have enough to blow down a couple of doors. Its SO stupid. Also making airdrops less frequent and less rewarding, since getting so much in airdrops is unfair to people without a team of 5 like some people have.