LOL it is a six years newer design. What exactly would you expect?
for siglent to keep working on developing new scopes, new generations of product.
They will of course, but unless they are working on ASIC's, it's unlikely they will be able to match Rigol's pricing for the foreseable future.
In DHO series only ASIC is analog front end ASIC. Their ADC is not ASIC as much as local ADC source. That ADC can be replaced with any other ADC, and if you get good one at a good price, you can match them.
And Siglent already made it's own analog ASICs, a front end chip for 7000 and amp for differential high speed probe.
Truth is that Rigol had to develop it's own ADCs because they had problems in acquiring high performance chips because they burned the bridges with Keysight and that poisoned the well. Combine that with push in China to decouple and government incentives to do so and ADC development ensued...
Siglent is in much better situation that way and does not need it. If they do come to that point, they will react too. But truth is that ADC development is moving forward and some commercial designs might not be more expensive than in house low volume production.