Re: This is silly MS
Having done this migration around 18 months ago for around 5000 users, I'd say do it and don't look back, the "premium" features on the list are actually not very well used across any organization and the cost saving on Webex can be huge and the functionality of Teams is so much better, I don't mind Zoom for VC but Teams has the extra integration with Chat etc.
Also the Teams Meeting room devices - deployed around 150 of those in various formats from Yealink and they have been great.