Silverlancer
Golem
I think that boils into a risk/reward kinda group where if you're good enough, and willing to take the risk to fight him without hallowed equipment, or killing the mech, plantera, golem then you can do it, but its supposed to be quite a bit more difficult, however, this also means the drops he has if you do beat him will absolutely rekk everything else besides the lunar tier, and Flairon does that too.It's an easy boss once you learn his attack patterns. Sure, the damage if you get hit directly with endgame 1.2.4 gear is immense, as well as titanium armor, but the gear you get from him allows the mechanicals and any other boss in Hardmode to get smashed.
Its something of a player decision at that point..... kinda like "Can I really handle this boss now? Is it worth fighting him, and potentially spending hours getting a truffle worm only to die, and have wasted it?"