How much DPS vs Shaper and life do you need to make a boss killer that's viable? This is excluding Endurance charges and Crabs even those you got crabs. On PoB with "Shaper selected" you want to have 400-500k for a smooth experience. However, please learn the details first with PoE Currency trade here.

Some prefer to be tankier with "safer" but longer fights, but others would argue that having 2M shaper dps and weaker defenses exposes you to a shorter fight, so making it actually safer.Keep in mind, for the fight to be safer with a 2M dps weak defenses built, you need to be familiar with the mechanics of the fight. In order to increase your defensive capabilities, you need to grab some PoE buy Items to improve your gear.

▶ You can do Shaper with 200k DPS. It's mostly a mechanical fight with only certain stages that require a DPS check.
▶ For a smooth experience I'd say you should get at least 350k+ DPS.
▶ Anything above 400k DPS is easy to do Shaper with.
▶ Shaper hits fairly hard in melee range, but like 4k Life without much mitigation is good enough to survive 1 hit. If you want to be safe, then aim for 5k+ Life. His balls will most likely kill you, even with high Cold res and a Sapphire flask. At most you can only tank one, then die to the second.