Welcome to the community!
As a UI designer, does that mean I can totally say bye to Developers (means I won’t need them anymore) once starting use Webflow soon?
It really depends on the project. Not every site needs login functionality, but this isn’t something that Webflow offers by default—you’ll need to look into integrations. That said, there are a growing number of options for visual development tools that will make it much less daunting to do yourself.
Just design the web version and Webflow will auto-generates its responsive version without any hassle and bugs’ worries, right?
Not really, you design for each breakpoint and it will serve up the right version based on the device size. Just like in normal CSS, your changes cascade to the next breakpoint so you only need to change the elements that aren’t working for a particular size.
Could Webflow create even like Airbnb kinda websites?
Not by itself, but thankfully there are a number of no-code tools that have been used alongside Webflow (like Memberstack for member functionality or Monto for reviews) that can help.