IMO it is only the Figo Aspire which has got its bootlid as well as the bumper protruding equally. I really doubt of the bootlid will keep itself locked even in case of a slight hit by any vehicle from back. I was also a bit ignorant about the rear bumper thing but then two incidents happened with me which made me aware of the same:
1) While driving the Corolla and an Esteem hit from.back on a signal. There was a minor dent on the bumper of the Corolla and the Esteem was in a bit sorry state; drivable though.
2) I ended up hitting a SX4 (mind you, it has got a strong a##) from back and was surprised to see the damage. The bumper only got dented and its hooks got broken resulting in the bumper of SX4 getting losen from right end. While the front bumper and left fog lamp of the Scorpio were in a sorry state. I am quite sure that the rear bumper of SX4 performed its duty really well and hasn't let any force of this minor collision transfer to the boot.
Compact sedans:
They have a really weak A##, weaker than even the hatchbacks IMO. Or maybe because of a smaller area of hit where the force gets concentrated result in a higher damage. Once I ended up tailgating a Honda Amaze at quite high speed and the way the Amaze took the hit has left me in two minds regarding the safety of these compact sedans in the event of a rear end collision. Seriously, the boot lid etc were all deformed like a foil paper, rear seat mounts broken, chassis got deformed even under rear seat like it wasn't strong at all and final outcome was actually horrific. This left me in two minds if the build of these compact sedans is worse or worst.
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Looking at this image given by Ford itself, its only the boot part where there is complete absence of the high tensile steel components or say the true internal strength. Now when we have idiots doing 150 or even 200+ on expressways, no one will at least like to be rear ended by then. As already mentioned, being a Ford the build is disappointing but if you compare to Swift DZire, Xcent or Amaze then the build is comparable to the segment or maybe marginally better.