Threadripper changed the definition of HEDT, but rumor is that there won't be a Zen 3/4 option for it, and those users will only have Intel as an option. That's the unusual departure.
The disappointing thing is that this chip on paper has the bandwidth - some pro users would likely be happy to get Zen 4 with the option for 0-2 PCIe 4.0x16 slots, and 2-6 PCIe 4.0x8 slots. That's the amount of bandwidth this CPU has.
Chagall/Zen 3 did drop the TRX40 chipset but again the sWRX8 class was only a small uplift from prosumer anyways so I'm not sure the loss of sTR4 is all that interesting or best compared to AM5. The question is whether they decide to continue to release Threadripper Pros at an attractive price point not lamenting why AM5 didn't absorb sTR4.
I won't comment much on the rumour side but overall I'm not as worried about whether things are named "Threadripper" vs "Threadripper PRO" as this never set the price floor anyways E.g. a 16 core Ryzen Threadripper PRO 3950X was $350 MSRP higher than a 16 core Ryzen 9 3950X.
Whether or not they ever release anymore low price high lane count options is an interesting question but that AM5 was supposed answer this and because it didn't AM5 is a departure from the past is just too many layers of assumption, rumour, and leaks to make any useful discussion about.