Non-tensioning fittings are coupled with tensioning fittings to support the cable as it is tightened to the appropriate level to pass building code requirements.
Swageless fittings only work with 1x19 LH lay strand cable. They are designed with a set of tiny jaws which bite into the cable when tensioned. Their engineered moving parts make them more expensive than swaged fittings.
Swaged fittings must be hydraulically crimped to the cable. The fittings themselves, being technically simple, are more reliable and less expensive than swageless fittings.
Every cable run needs at least one tensioning fitting to ensure the cable can be made taut enough to pass building code requirements.