Detection of probe attenuation for the readout might be obsolete, but powering an active or differential probe sure is not. Of course Tektronix could hardly support their obsolete but more suitable older probe interface, so they painted themselves into a corner there.
It's a pity that there was never a cross-manufacturer standard for probe interfaces. Nowadays USB is the obvious way to power a probe as pretty much all scopes from the last 10+ years have a USB A connector
Probe attenuation readout was the only thing supported by multiple manufacturers. It might be a coincidence, but Tektronix stopped supporting it not long after they sold off their cable manufacturing infrastructure in the 1990s so could not longer make their own probe cable with the extra wire for the readout connection.
USB might not be quite as good as the LEMO connector for probe power that Tektronix originally used, but their new DSO also lacks any USB sockets on the front panel. Lack of support for active probes and 50 ohm termination seems odd for a 500 MHz DSO, but they got the bandwidth for free.
I happen to show that here:
DSOs should have a real advantage for glitch hunting, but as you showed, some are much better than others. The trend as processor performance has increased is to do the glitch hunting during post-processing, but this Tektronix DSO apparently does not even support that.
Analog CRTs with higher acceleration voltage show rare events better, but at a completely different level of performance, the microchannel plate CRTs used in the Tektronix 2467, 7104, and 11302 would show the glitches with no problem at all at normal intensity, and that was one of their big applications. A variable persistence (but not bistable!) analog storage CRTs could do it also.