I'm impressed that you've purchased all those scopes and can give real use experience advice for all of them.
Never seen any screenshots ..............
I have access to quite a few 'scopes at the University so sometimes I get to play with them.
It's pretty clear which 'scope is starring in Dave's videos lately, he's even posted in the forums saying, "... the Keysight, they got practically everything on that right and is my preferred daily driver, and most people seem to agree.".
A Keysight costs $160 more than your Siglent, sure, but if you're a professional who uses a 'scope for paid work or are already going for a Siglent over a Rigol then you're demanding "the next level" so why compromise with a half-step when a full step up the ladder is only 30% more?
Which Keysight is 160 USD more than which Siglent?
We have to compare on equal terms.
Also, Rigol or Siglent type of software hacks are not the same as opening, and potentially damage, scope and solder stuff in it. Warranty is definitely gone. Nor Siglent nor Rigol ever make problems if you send in "enhanced scope". They might change a motherboard and erase hacked licenses, but will not refuse warranty. You simply reapply licenses.
Soldering inside is nor risk free nor equally easy. Siglent scopes are coming basically unlocked, so no need for hacking at all.
DSOX1204A+D1200BW2A+D1200AUTA+D1200EMBA is 2000USD + tax. There is no hack for the 4ch one.
DSOX1102A + 100MHZ UPGRADE+ DSOX1AUTO+DSOX1EMB is 1200USD + tax. Professionals won't hack the scope. You get 2+0,5 Ch scope.
And as much as I like Dave, he is very quick to dismiss things as not good if they are different to what is he used to.
Many people are, many are not. He uses MSOX3054 as daily drive for years, and is very used to and familiar to that U/I.
I don't find my MSOX3000T user interface especially logical. I had to spend many hours before I memorized what is where.
So I did with Rigol, and Picoscope, and Tek and LeCroy...
I personally find LeCroy most logical...Go figure.
So I take " they are doing it RIGHT" with a grain of salt, and read it " they are doing it how I'm used to so it feels familiar"