Hi,
The CMS may be able handle it, but expect some minor pain points. It is definitely worth a test for the potential ongoing design flexibility and low maintenance joy it will provide!
With reference to AVVO:
- General structure and navigation . Yes
- Practice area page with filters. This would require custom code (refer to posts regarding mixitup plugin). Simpler filter options might be achieved with tabs or even links to other pages instead of js filtering solutions.
This is a very good resource. Well it is the only one as webflow don’t seem to have a source of truth 
. ► [LIST] Feature Availability & Limits
A likely painful issue you may encounter: In your list of lawyers you may want to show the lawyer’s multiple practise areas. You can’t display a list in a list, only on the lawyer item page itself. There are some different approaches lurking around here somewhere…
You will want to test out site search to see how that works for you.Also test typical data entry, updates and search in the editor.
If you need ongoing sync of data from another source / app, bear in mind you will need to make the external app the place you maintain records as webflow does not have record create / update webhooks or zap triggers yet.