I think this is a posterchild of "do we like cards that combo with themselves?" Finding out you can combo
Merfolk Looter with
Zombify is an epiphany. Having the combo on the same card feels cheesy, it becomes good stuff + generic graveyard synergy.
I think the answer is yes, we do like cards that can enable themselves.
One of the issues we often have when building riptide cubes is getting micro archetype decks to function without having to go completely overboard on space usage power-band broadness. Although one could easily make a deck like Zombie Tribal a thing by just jamming every half-decent zombie and zombie lord into the cube, there would simply not be much room for anything else in that section. Instead, a good designer would look for cards which can go into as many decks as possible while still maintaining the desired power level. For example, if a designer wants to enable a Zombie deck and an Aristocrats deck, then
Lazotep Reaver is a strong inclusion. While the card's power level isn't off the charts, it makes two bodies of the relevant type which can also be sacrificed for value. This leads to an important conclusion: cards which can wear multiple hats are usually good additions.
Take a card like
Cryptbreaker. The card does so many things! It's enables discard and graveyard strategies, it serves as an army in a can, and it works as a Zombies payoff. But, the card is effectively self-enabling. In theory, your entire game could be focused on just playing crypt breaker, making tons of tokens, and then burying the opponent in card advantage. It takes a little while to get going, but it's not like turning cards into
Ashcoat Bears is a big investment. This play pattern doesn't make the
Cryptbreaker cheesy or boring, if anything it makes the card more playable: it gives you a gameplan even if the rest of a given draw is sub-par. Our stitcher friend is very much akin to
Cryptbreaker. She does help to enable herself, but a variety of different decks want her. My first thought when I saw her was "wow, this is a great enabler for Blue-Black
Drakes!"
Seemingly the biggest strike people seem to have against Obsessive Stitcher is the fact that she can act as both enablers for the reanimation deck. Reanimator is an A+B+C deck. A player needs a big creature, a way to get that creature into the graveyard, and a way to cheat it back out. Reanimator decks don't just win because they have
Cephalid Looter into
Dread Return. They need a third piece: the creature. One of the reasons why big cycling creatures like
Titanoth Rex or our new Whale friend from M21 are worth playing in cube is because they cut out the need for a third piece in reanimator. This card effectively represents the same paradigm, it's just now our graveyard dump piece is attached to the reanimation spell as opposed to the reanimation target.
Obsessive Stitcher is pretty great and a welcome addition to any riptide cube with a reasonable desire for a discard outlet or reanimation effects.