Thank you for clarification!

https://www.passpack.com/online/#0

stores up to 100 passwords in the free account and supports two-factor authentication both with the yubikey or with your email. Actually I’m evaluating it even if I own much more passwords ( : solved with 2 accounts? 1 for light accounts and the other for accounts dealing with money as for your bank or paypal account? don’t know).

the keepassdroid solution is attractive, but it depends on how you use it. Keys used to decrypt could be stolen if kept on the phone or even in the cache of the downloads and keyloggers are active on android too (actually don’t know about screenloggers), so the good solution would be implementation of OTP from yubikey (or key pushing) on keepassdroid too…but again you need to keep always the phone and the yubikey always with you.
At the moment I use keepass on my old nokia (java without fast data connection except for the classic GSM), and doubt about moving to a smartphone depends on this too.

if you have no slog (seperate log/journal), then the journal exists within your pool.
and if your paranoud, ext4 will work this same method by adjusting its options.

i didnt see any talk about the performance issues with using a slog though.

all writes to an slog happen one at a time (queue depth=1 always). so the latency of your writes matter all other performance metrics on you slog device.

if you have multible slog devs you can increase performance, cause each will be used for a different writer, but only multible writers cause async blocks the current one.

while zfs is waiting for the slog, it will group other writes together to create a larger transaction though, so all isnt lost, but you generally are going have to have a lot of writers to gain performance here.

other things to muse over,
zfs never verifies writes to the slog are correct, till it needs them for recovery.
zfs depends on the slog not to lie about it flushing data to disk, or you might as well use async writes instead.