Since Stratos and Shadow Mist both activate when Special Summoned, A Hero Lives is more impactful and widespread in anything that incorporates them than E-Emergency Call. That said, I'm not sure hitting anything just to bring Stratos back makes sense. Stratos can be searched by Shadow Mist, E-Emergency Call, A Hero Lives, RotA, and another copy of himself while activating on Special Summon without any kind of OPT clause. If anything is guaranteed future support it's Heroes, so I'd rather it not be watered down to accommodate Stratos, a card that was broken from the day it was released that set a precedent for modern conventional OPT clauses for similar cards today. When its precedent isn't observed, we have SPYRAL Quik-Fix. I'd prefer Stratos be errata'd and put to 3.
Limiting Lycoris effectively reduces its copies from 12 to 10 (Terraforming>Lightstage>Candina>search). The same holds true for Reincarnation, but the Limit on Reincarnation is more sensible because of how multiple copies of Reincarnation interact. Triple Reincarnation with one Lycoris will hurt just as much as triple Lycoris with one Reincarnation, and Reincarnation has the added value of revival on either turn. For the correct hits on Trickstars we needn't look any further than the OCG where Terraforming and Reincarnation are both Limited to 1 and we still see the occasional Trickstar top, just occasional enough to be palatable.
Banning Knightmare Phoenix deprives almost every deck in the game of a utility Link-2 that pops a backrow for a fair investment. If you want to hit "the board ", a hit to either Iblee or Mermaid which are only used in devoted Knightmare builds to establish full boards makes more sense.
With regards to Union Hangar but not Terraforming to 1:
Putting Field Spells but not Terraforming to 1 doesn't actually put them to 1.
Terraforming has been an automatic 3-of in a Tier 0-1 deck since MACR (Dracos/Trickstars/SPYRALS have inhabited a spot(s) there ever since).