They do send confirmations and thank you emails (sometimes long afterwards when the patch or hotfix has deployed). Honestly, those are unnecessary.
CDPR's bug reporting system is inadequate for a game with this many serious bugs. There is a character limit for REDSupport submissions (1000 characters iirc) so concision is needed. There are also not enough useful categories to file reports under (I filed a 1.1 mod randomization bug report under weapons because it was the least inappropriate classification I could find).
All the issues I have tabled for report require screenshots, video and/or a save file to demonstrate a problem, which REDSupport personnel do ask for but its a clumsy back and forth over email. Also what with the ransomware attack, sending/receiving attachments over email is an infosec nightmare.
Their issue tracker is entirely private and forum users are directed to REDSupport as the first port of call when they experience problems. This is not good in my opinion because it encourages players to privately submit high volumes of unverified, inaccurate or outright false information. This just clogs CDPR's issue tracker with bogus reports making life incredibly hard for their own devs.
So I just create or participate in bug hunting threads on this forum, encourage the sharing of data and testing methodologies so we can (a) reproduce the problem, (b) collectively learn how, when and why the problem occurs so we can (c) submit a lower volume of higher quality bug reports via REDSupport.
I personally think Warframe's unofficial bug hunting threads are the gold standard if the devs are not going to have a public issue tracker:
Operation: Orphix Venom - Bug Hunting Megathread (Read First Post!) - PC Bugs - Warframe Forums
Warframe is a really buggy game and part of the reason they can hotfix incredibly fast is because the PC playerbase is effectively a giant team of beta testers and are used to unofficial bug reporting in a structured, searchable way. I would honestly just copy their community team sticky with the templates and formatting they use.
I cannot submit accurate bug reports without talking about it with other people here first. When I reported the 1.1 mod randomization bug, I started out with a fundamentally incorrect understanding of what the problem even was. I was only able to submit accurate documentation on the features of this bug because other players falsified my data, modeled the problem better than I did and had tools I did not in order to gather information about game systems I had no knowledge of. Without this discussion, nothing I submitted would have been actionable. In fact, it would have resulted in a bunch of devs looking for the wrong needle in the wrong haystack, which is how bugs never get fixed.
The fastest way to solve any problem is to gather loads of smart people together and share ideas in a methodical way. The 8mb save data thread is a great example of this. CDPR were able to address this issue incredibly quickly because players shared ideas on this forum and understood the precise nature of the problem before reporting it. When they did report it, they had evidence and an exact method to reproduce it.