Aside from needing to maintain a (potentially-remote) connection, are there any disadvantages to jamming? AFAICT, there are not, which seems somewhat problematic to me:
Player A buys three synthetic morphs to swap between, plus he also occasionally sleeves into an infomorph for mesh activity. Every time he moves from one morph to another, he has to make Integration and Alienation tests (at -20 for the infomorph, -10 for the synthetics, and potentially an extra -30 for "exotic" synthetics) which inflict substantial action penalties or Stress damage if failed. The Integration test even inflicts a penalty on physical actions on success unless it's an Exceptional or Critical success.
Player B buys three identical synthetic morphs, but adds a Ghostrider module to each. He sleeves himself as an infomorph and spends all his time migrating from one Ghostrider to another and jamming whichever morph contains the Ghostrider he's currently occupying. AFAICT, he controls his jammed morph and experiences the world through it in exactly the same way as Player A controls and experiences his sleeved morph - except Player B never has to test Integration or Alienation, so he never suffers any action penalties or Stress damage for moving about. The only drawbacks suffered by Player B are the additional Low cost per morph for adding the Ghostriders and requiring one extra Action Turn per switch to initiate jamming after moving to the new Ghostrider. The only stated drawback to jamming I've seen mentioned, communication issues, does not apply as the Ghostrider places the infomorph literally inside the other morph's head, giving a direct wired connection.
Given that jamming and sleeving seem to behave more-or-less identically, why does one require Integration tests which can give action penalties for days afterward and Alienation tests which can inflict Stress damage, even if you're moving into a morph identical to the one you just left, while the other takes only a few seconds (1 Action Turn = 3 seconds) to adjust to and is automatically successful, even if you're shifting from a baseline Splicer to a tricked-out Swarmanoid?