Speculation: all that money for a customized Cityflo 650 ATC implementation, plus GIDS, it’s fair to ask whether all of that GIDS budget could’ve gone towards platform screen doors instead, solving the intrusion problem at the source. I don't know 100% if PSDs could've been done with the same budget, but in my earlier post, I linked news going back 2+ years talking about software and signalling problems due to the needlessly over-customized system.
IMO, if they had stuck with off-the-shelf Cityflo 650 instead of reinventing the wheel, and dropped GIDS as redundant, they probably would have had enough money for Platform Screen Doors for the 15 stations. GIDS is not installed at the 10 surface stops. There is precedence with the Seville Metro running low floors with PSDs.