Whatever you mean by "mastered"
SL1, no equipment, no spells, no rolling, no consumables, final destination
Stop being retarded.
In none of my videos i did any of the above. In fact, i made it a point to use every resource available to me precisely to dispell this stupid strawman argument. Even on my SL1 run, aside for the basic SL1 challenge itself (and my rule not to upgrade my weapon past the +10/+4 mark, the only little concession i made to myself to make the game a bit harder), and of course the rule to avoid using summons (which goes without saying), i used every tool at my disposal and every known dirty trick you can think of. Bleed, frost, rot, buffs before a fight, all the good weapon arts like Square Off or Lion's Claw and so on. It's all there in every video i made. At no point you can accuse me of having been a try hard, or having done anything unreasonable to make the game harder (within the scope of the SL1 challenge itself, but note i didn't hold back on my SL150 character either).
Look at my fight with Mogh:
Every single ounce of resource was used by me to make this fight easier. Pots to proc the frost faster, personal buffs of various kinds, all the right gear to maximize my chances etc.
So what does it mean to master the game? Well, as you can see in the above, i pretty much mastered his movie set, to the point making the game artificially harder would have just been a pointless exercise in autism (which is never fun for me). It's enough for me to feel i was in control of the fight the entire time. More than that would have been just a form of show off.
Now i'm not asking new players to get to this level of mastery (which one can only obtain after years of experience), but i think most people should strive to at least feel like they actually beat the boss by overcoming the challenge instead of side stepping it with summons and the like. Keep in mind i'm not opposed to the use of those means, but they should be kept as a last resort. If the player finds the challenge insurmountable, then sure, use the summons, after all, there's always next time, but if you aren't even bothering to put the effort and you are just bypassing every single obstacle with summons, why play the game at all?