First of all : more real-life testing, active maintenance, and have a UI and UX experience that informs people / users.
For example: if a new user tries to create a multi-sig, don't act like they know everything. 
A "normal" and "advanced" mode is necessary, most of this software is simple not usable enough.
(same counts for Green wallet btw, where you can't even get a full list of the addresses, and some BIP39 compatibility in edge cases is broken.
And for Satoshi's sake: test and iterate stuff.
The current software is of course lightyears better than what we had in 2015 for example, but still, it sux in my opinion.
I'm a software tester / QA myself... I might be ultra biased 😉