Yes, at first glance you could come to this conclusion - I thought so too.
But let's start with the outward appearance.
The workmanship is even more solid, the incremental encoders have been significantly improved and the internal shielding and construction is more elaborate.
Then we go one level deeper, the board.
The 12-bit converters are not exactly the cheapest, one for each of two channels.
Then the fan is PWM-controlled, the memory remains at 200/100Mpts (2/4ch), while with the SDS2k+ the memory is halved when the 10bit mode is used.
In addition to the 12bit native resolution, there are +3bit Eres, by the way, the hardware itself is more performant, Eres and Averaging are no longer math functions.
More trigger functions (delay, nth-edge, qualified), four mathchannels, four memorychannels, digital filters, memory management, etc, etc...
It's simply a higher class and that's why it costs a bit more.
That doesn't make the SDS2000+plus any worse, I still think it's one of the best affordable scopes, but for the higher price of the HD you get more and that's the point.
When I switched from the SDS2k+ to the HD, I was initially only fascinated by the 12 bit, the rest seemed the same to me.
But little by little I discovered the advantages that are there, which is no wonder, they both have the same UI, so you don't quickly realize that they are different.