osrs gets away with bosses having weaknesses because the barrier to entry is literally just a decent weapon and void. In rs3 a decent weapon and hybrid armor will get you kills at bosses but it will be miserable, and a majority of bosses would still be off limits at that point.
I think necromancy is great, it got so many players into PVM that weren't PVMing at all before
osrs gets away with bosses having weaknesses because the barrier to entry is literally just a decent weapon and void. In rs3 a decent weapon and hybrid armor will get you kills at bosses but it will be miserable, and a majority of bosses would still be off limits at that point.