The difference lies in where the shutter is held and what happens to the bottom slat. Anti-lift locks and shutter blockers are well known products and each does its job. The T-profile reinforcement strengthens a different part.
Two points make the difference:
- Where it is anchored. Many of those systems hold the shutter at one point, often in the middle, or lock it against the floor or the windowsill. The T-profile reinforcement anchors it at both ends, against the wall.
- The bottom slat. If it is still the original one, it can bend even when held at one point. With the steel T-profile joined to it, it no longer bends.
There is a type by type comparison in T-profile reinforcement compared with locks and blockers.