Yes, and as long as people don’t dump all the spears on the first phase it shouldn’t be a problem. You can probably still Lust+Spear first phase, and double spear the 2nd just for the AoE damage + 1 stack of debuff and be fine. If it’s a longer fight then just spear one per phase.
People in general don’t understand how big pre-scale nerfs are. Everything compounds as keys get higher.
I’m taking these numbers from Keystone Guru so I don’t know if these are pre or post nerf:
M+2 Stitchflesh has 94,523,626 HP
M+10 Stitchflesh has 202,796,143 HP
Based on the key scaling provided by Blizzard which is 10% per key increase:
Pre-nerf:
+2: 94,523,626
+3: 103,975,988
+4: 114,373,587
+5: 125,810,946
+6: 138,392,040
+7: 152,231,244
+8: 167,454,369
+9: 184,199,805
+10: 202,619,785 (slightly off from not using decimals)
If we subtract 15% from M2 then it looks like this:
+2: 80,345,082
+3: 88,379,590
+4: 97,217,549
+5: 106,939,304
+6: 117,633,234
+7: 129,396,557
+8: 142,336,212
+9: 156,569,833
+10: 172,226,817
Look at the difference in HP scaling from the 15%, now imagine the damage scaling from festering rot at 30%. Stitchflesh now has less HP in a +10 than it did in a +9 and close to what it was in +8. It’s 30,392,968 less HP pre+10 vs post+10.
Edit: Looks like the HP nerf was 20%, not 15%, so the numbers I worked up are even bigger in terms of impact.