TBH, anyone I interact with who is tech savvy doesn't use email, so I really don't need those features.
You live in a strange bubble.
Between github, SMS, social media, IRC & slack, video-conferencing, blogs, RSS, etc., email has become the medium of last resort. I still get a lot of email, but it's mostly automated notifications, and I usually have to log in somewhere to actually recieve a document because email is insecure.
Plenty of people I know use that at work, but email is really nice, and I love the features Thunderbird has.
Perhaps he/she work for a company that do not really know IT so force their workers to use limited and limiting platforms, but it that's remain for personal world then no, it's might appear to you a tech savvy person but that's only due to Kant-ian glasses, not reality.