@johnpeter 
Welcome!!!
You can see what people are asking for on the Webflow Wishlist to get a better idea of Webflow’s current limitations are.
While Webflow does have these limitations, there are third party solutions which make some of these things possible. For example Memberstack integrates with Webflow giving your the ability to create Membership websites and charge for those memberships if you choose to do so.
Another example is Weglot which also integrates with Webflow so you can make your website multilingual.
It’s possible to build most sites in Webflow and if I’m being honest, by using Webflow, you’ll have those websites finished in a fraction of the time you would if you were using another platform with better performance. If custom code or a third party solution doesn’t get the job done, there are experts you can hire who have the skills to get things done.
I hope everything I said was clear for you, let me know if you have any further questions.