Update 1/16 - Adblock has informed BleepingComputer that its engineers fixed the problem and released ABP 3.22.1 and AB 5.17.1 on the Opera and Edge extension stores. The same versions are currently in review on the Mozilla and Chrome add-on stores, and should be made available soon.
LastPass had a list of concerning design choices, using cloud is not one of them. Your personal preference here is irrelevant.
It’s really not. You can’t expect the average user to set up yet another service to sync their devices in a way that is conflict-free and available at all times for writes. Sooner or later a write will be lost. It’s very much a trade-off between partition tolerance (synchronization of multiple devices), consistency, and availability - see the CAP theorem.
Bitwarden maintains consistency by refusing writes when the server is unreachable. Keepass just delegates partitioning to another service entirely (e.g. Syncthing), which opens the possibility of losing edits.
Considering the breaches lastpass had in just the last year, using their cloud service is absolutely a concerning choice. how they got breached is especially egregious.