We chose TPC-C because it's far more understood than TPC-E in 2018. We wanted to provide understandable benchmarks that can be put into context with other databases. Other databases report TPC-C numbers, so we choose to do so as well.
And the top results are usually crazy high number of cores clusters. The Sun example was over 1700 cores.
The open source databases didn't play that game, so TPC-C became irrelevant.
Too bad there isn't a good way to directly compare the healthy survivors.