I use a few different versions of keepass on two laptops and an android, and they all share a keyfile through dropbox. I get most of the same functionality that my wife does through LastPass. It's convenient enough that I don't see any reason to migrate to LastPass, despite their much more polished user experience.
I'm forced to use LastPass at work, and personally find KeePass to be a much better user experience.
A. The auto-fill extensions don't work on enough sites to make it annoying (maybe ~20%). Auto-type is a more consistent workflow for me.
B. Lastpass (and friends) browser extension doesn't do anything for desktop apps, SSH sessions, or anything outside the browser. You have to copy and paste one at a time.
C. I like all my passwords to be a particular format because it frequently happens that I have to type them in manually (Phone, vCenter console, BIOS, etc.) and I just like that to be easy. (I use 5 groups of 4 lower case separated by periods, with one number and one upper case letter in the last group. Still very strong but also manageable to type into an iPhone).
D. I like to record more than just passwords (the email I used, answers to security questions (always random, but legit looking), bank and credit card details, stuff like that). The KeePass UI for keeping those kinds of notes is just so much cleaner, simpler, and better than anything else.
E. KeePassXC has first class support for Yubikeys.
One mitigation is to use Firefox account containers.
If I navigate to what claims to be Bank of America, but the tab doesn't open in my "Banking" container, that's a huge red flag.
Also, as another poster mentioned, Lastpass sometimes fails to autofill. Unless a manager can achieve 100% error free operation (unlikely), even autofill managers will also have a risk of phishing.
I don't think there's one correct answer. For me, as an expert who's confident about my security posture (2FA, verbal passwords for vendors that can reset 2FA, backup codes stored securely offsite), I value the simplicity of Keepass.
The website from the service in question also suffers from severe JS-errors on their page (FF 66).
I always manage my passwords on my computers, and type in on phones as needed. Simpler and just works.
To easy the pain of typing passwords, I always follow a consistent format that's easier. Example:
7,#/T8z%FS%zht6S
ctaq.zwjd.qnbu.ut1A
The first one is terrible to type on a little Android keyboard whereas the second is a breeze, and still perfectly respectable as far as password strength goes.
[1]something that will not likely happen between family, work, and chores around having a large property
I don't have time to really think about all this complexity and what it means for my security. So I just avoid it entirely.