$ lintian Bisq-64bit-1.9.8.deb prints errors

I downloaded Bisq-64bit-1.9.8.deb from Bisq software.

I ran lintian since I noticed GDebi Package Installer does so, to check.

$ lintian Bisq-64bit-1.9.8.deb


E: bisq: debian-changelog-file-missing
E: bisq: dir-or-file-in-opt opt/bisq/
E: bisq: dir-or-file-in-opt opt/bisq/bin/
E: bisq: dir-or-file-in-opt opt/bisq/bin/Bisq
E: bisq: dir-or-file-in-opt ... use --no-tag-display-limit to see all (or pipe to a file/program)
E: bisq: embedded-library opt/bisq/lib/runtime/lib/libfreetype.so: freetype
E: bisq: embedded-library opt/bisq/lib/runtime/lib/libjavajpeg.so: libjpeg
E: bisq: embedded-library opt/bisq/lib/runtime/lib/liblcms.so: lcms2
E: bisq: embedded-library ... use --no-tag-display-limit to see all (or pipe to a file/program)
E: bisq: extended-description-is-empty
E: bisq: no-copyright-file
E: bisq: unstripped-binary-or-object opt/bisq/bin/Bisq
E: bisq: unstripped-binary-or-object opt/bisq/lib/runtime/lib/jexec
E: bisq: unstripped-binary-or-object opt/bisq/lib/runtime/lib/jspawnhelper
E: bisq: unstripped-binary-or-object ... use --no-tag-display-limit to see all (or pipe to a file/program)

(I omitted the warnings.)

Could someone help me understand the errors please?

Should I do or fix something before updating Bisq (i.e. running $ dpkg -i Bisq-64bit-1.9.8)?

Don’t let the “moderator” tag fool, you, I’m just a regular user, but I’ve never used lintian to be able to install and use Bisq properly with dpkg -i.
So, if this is stopping you from using Bisq, I think you shouldn’t. If you’re simply curious, that’s great, just wait for replies and raise the thread if you don’t have good ones.

Thanks for the note. Yeah I am mostly curious.
I had never used Lintian so far. First time.
Still, if someone has an idea of what these Errors mean (or thoughts about Lintian), I am interested.