That is true.
But there’s also people who do know what they are doing and who have experienced lots of other similar kit, and know how to dial in a tone on kit.
For my part, I’ve owned and used various amps and modelling kit from Boss, Zoom, Line 6, Digitech, Yamaha, and Nux as well as more conventional amps from Roland, Vox, and Bugera.
I’ve used tube amps including a 100W Marshall and a 50W Fender I used to play regularly, as well as some Laney’s and Blackstars. Currently, I frequently do jam sessions with a 50W Blackstar and, occasionally, a 50W Orange amp.
I tend to hoard kit, and I don’t tend to get rid of stuff unless it really doesn’t gel with me or unless it’s taking up space or I think someone else would get better use from it.
It was with a heavy heart I sold my Katana Mk1 100W about 2 years ago, but I knew it was something I just couldn’t justify keeping for the foreseeable future. If the circumstances change, I will buy another without hesitation.
I gave the Spark 40 away and was glad to get rid of it.
I spent most of two years trying to make it work for me. I got some decent tones, but nothing that blew me out of the water and, except for the Jimi Hendrix pack (which I did buy) which was pretty nice, there was nothing in the Spark 40 for me that I couldn’t get from other amps I own.
And things like the bass-heavy response bugged me. And, because I actually do know how to use EQ, when they eventually introduced an EQ it was a good thing, except you couldn’t use it when using a modulation pedal, which was lame.
In my experience, the THR10 is a better sounding and easier to use, and better made desktop amp. It doesn’t have quite the range of tones of the Spark 40, but that’s more than made up for (for me) by the better sound quality.
In my experience, if you have room for a full-sized Katana, for a similar price, a 50W Katana is a far better buy than a Spark 40: it sounds better, has a far wider range of tones and effects, is more versatile in general, and sounds good from bedroom volumes to full stage performances.