Dunno if you have ever used Pulseview, with all the respect for developers group it could be good for a newbie in conjunction with 10 dollars Cypress 8Ch LA dongle, for a professional is a joke.
The initial release of KiCad was published in 1992 or 31 years ago. In comparison the stable release of libsigrok was released about 3 years ago. Some claim that the sigrok main developer abandoned the project, but as far as I am aware other continue to developing it. There is much more to be desired in terms of capabilities and it takes time and devotion. The main issues with logic analyzers probably is that the advance triggering and filtering suppose to be performed on the accusation module presumably on the FPGA or MCU. In other words, such project suppose to developed the device firmware as well. This might be an issues in most of the cases. Currently, an interesting implementation is sigrok-pico https://github.com/pico-coder/sigrok-pico. It is my understanding that can achieve 250 MHz sampling rate. For 6 USD (WiFi edition) I would say, it is quite an achievement, still there there is lots of work to be done about the WiFi connectivity as well as how this logic analyzer works as whole.
As you said, Trigger / Conditional Capture are the aspects where Sigrok fails to satisfy any even barely serious demand.
HW wise you have no input protections and no variable thresholds, software wise you have basic (to say the least) selectable trigger mechanism (rising/falling edges, advanced ones are in another world).
Dunno if this specific branch goes beyond "standard" Pulseview in any aspect, but if I go to its Github page I read :
At this time my pull request into the main sigrok repo has not been accepted.
Thus mainline releases of sigrok cli and pulseview do not support this repo.
so, for instance, you can forget to try it under Windows with an official binary release, you want to venture out in Windows compile process (good luck).
As I said, for a newbie / hobby works those are great tools almost for free, but we are far from something that is remotely comparable to professional ones.
My understanding about DSLogic LAs is that they are mainly used by hackers to trap external memory access in order to exploit application protection mechanisms.