There's a lot more explosive in an ERA box than in a typical incoming warhead, and there is a serious fragmentation and blast damage risk to those standing or sitting nearby.  The US doesn't typically let people ride tanks because tanks attract fire, and people fall off and get run over fairly often (a serious hazard in training, and a significant hazard in combat), and the US has plenty of Humvees and M-2 IFVs.  Other countries tended to both want to reduce training injuries and keep people away from the ERA blocks, and restricted tank riding at the same time.  You saw it a bit in Chechenyia with Russian tanks, but they lost a fair number of infantry to the secondary ERA explosions and stopped doing it.
I support putting the article back for that reason...