For most people in the environments where Teams is rolled out, the standard used to be either e-mail (using bloated clients like Outlook) or Skype for Business (formerly Microsoft Office Lync).

The question as to why those previous options can't be as good as the consumer-grade alternatives (such as the social networks they're often using) has already been settled long ago and they've accepted whatever BS answer they've been given.

Compared to what they used previously, Teams is indeed an upgrade (albeit small) and they are unlikely to question its quality as they've already accepted that the tools they use in their enterprise are terrible compared to consumer-grade alternatives they use outside of the enterprise.

The real eye-opener for them would be to try Slack, where they would suddenly realize that office chat doesn't have to suck, though I have to say Slack is doing a great job over the last couple years at catching up to Teams when it comes to terribleness.