You don't necessarily need a Porsche for driving school.
Siglent scope is not a Posche car analogy, Siglent is like entry level cheap car for everyday usage.
Porsche analogy is a brand like oscilloscope from Lecroy or Keysight which cost is more than 100000 USD
And ZEEWEII DSO2512G is a bicycle with square wheels and a kerosene engine. It is nice toy to play with it, but it is not suitable for a real job
Here is how "Porsche" oscilloscope looks like
The main issue of ZEEWEII is that it doesn't have proper anti-alias filter and RF frontend, this is why I suggest to not buy it. Especially if you're novice and don't understand all pit falls of that toy. Not because it is cheap, but because it confuse it's user, has false specification and has too many pit falls which leads to a wrong understand oscilloscope for those who don't have experience with normal oscilloscope.
Well, I would agree, DSO2512 is a bicycle. A cheap classical one powered by animal traction, without any engine. So what? It can, quite probably, do what OP wants, which isn't a real job, but an aficionado's contraption never to be marketed (and, sorry to say, it probably will not make the bats flee from their habitat). About it not having a proper antialiasing filter/RF frontend, I would also agree, even not owning the device, just because to be so cheap, I guess many corners have to be cut. But I'm not so sure about having aliasing or RF problems at the frequencies that project will have to manage. It will probably be the same with any arduino-ish project a hobbyst would probably take on for some time from the beginning. If that hypotetical guy progress at the same pace than me, that means years.
I indeed found that my upgraded GDS1054B and my €40 Zeeweii DSO154 show remarkably similar things when I look at, say, ripple/noise on a cheap SMPS PSU or at a TP-Link router UART communication. Yet GDS1054B is now well above €500 delivered. I however don't really trust DSO154 at all above 10 MHz and wouldn't trust DSO2512 above 20 MHz, just because it sounds to good to be true. I would need some corroboration before trusting them so much.
But to say that any beginner must start by buying an oscilloscope worth €500, sounds to me a little bit overkill. Like saying one has to use two chemical anchors to hang a painting in the living room wall. I would use the cheapest plastic one instead and reserve the real good ones to tie the rope I will be hanging on while descending an 80-meter cave pit with rotten rock in the walls. True, my first oscilloscope is one of these entry level cheap cars. But I have a weak spot for quality tools, that perhaps not everybody has. That said, I found the cheap DSO154 is better to learn the basics, just because it's simpler, and I'm not afraid to wreck it. If some day it gives me a result I can't neither understand or correlate with the "good" oscilloscope, I'll probably ask here. Then you old gurus will say to me "That's aliasing, you idiot greenhorn" and I will learn one more thing.
And now... OMG! I tought DG811 was fancyful design... but looking at that Porsche-like Keysight... it really looks like a vegetable basket! It would look fine in hands of a peasant with the beret screwed to the eyebrows in the way to Tudela food market!