"Seamless integration" in this case doesn't read as statement about how well it works to me. It means the applications from the windows appear on your Linux desktop without the "seam" of a full windows desktop around them.
I do tend to let tabs accumulate, but then I turn off my PC at the end of the day and let all tabs fall into the void.
I like to start the day with a blank slate. Which seems to be such an uncommon thing to do that I couldn't convince FF on my last few Linux installs not to restore tabs when reopening. I've changed the obvious settings for it, I've set the flags in about:config, I've even completely disabled crash recovery and related features. It would still always reopen the last session