this was raised at the TfL board yesterday and they said MTR have put extra staff on the platforms to assist passengers and to respond in the event of a problem.
A daily user of this exact platform here; I can 100% confirm there are absolutely no extra staff on the platform to assist, at any time of day. This is totally bogus. Literally nothing has changed. There is a ramp propped up against the barrier near the Central line platform, but I've never seen it used except for booked assistance passengers. Of course there is often a staff member on the platform to make announcements in the peak hours (reading out what's on the departure screens) but the claim that there are additional staff as a result of this issue is entirely and provably false.
A lot of discussion on this thread about sophisticated mitigation measures but the problem is only severe at the western end of Ealing Broadway platform 4, by and underneath the station complex. The centre and east end of platform have a lower gap (so either the platform or the track must be on a gradient). The problematic zone is on a straight section. It would take two guys with a concrete mixer no more than an afternoon to fix the issue even within gold-plated railway safety standards, but of course that won't happen. As noted above, what is far more likely is that some jobsworth will simply close that part of the platform, update the SDO and turn one of the busiest Elizabeth Line stations into a pointless bottleneck. Dwell times are already long because of overcrowding caused by terminating trains at Paddington rather than further west.
Incidentally, the height of this section of platform is not its only problem. During the multi-million pound station update prior to Crossrail opening, the old toilets on Plat 4 were moved in order to make way for the new lifts, but the sewage pipes were not updated correctly and every time following rainfall the entire platform is affected by a gut-wrenching stench emanating from various drain covers. Since no staff ever stand in this area, nothing is done about it, but it is a total health hazard. So if the leap from the train onto an uneven platform doesn't get you, the smell will...