Not evolving
All linked data (URIs etc, not just some of "their own" URIs such as videos, images) need to be excluded from counts, unless you use a URL shortener, giving a link to some URIs, would leave hardly any characters left to comment why you have posted a link.
With so many competing communications options, the enforced brevity of tweets that was OK back in the day of SMS on low tech phones has become it's Achilles Heel in the heavy data use smartphone era: Many of us do not have the time to waste in jumping through hoops to squeeze anything other than quite simple concepts / comments into the character restriction, so for anything non trivial different social media tools are more useful than Twitter
I'm sure I'm not alone in only bothering to look at Twitter occasionally to follow some breaking news that is of interest to me, but do not use it on a regular basis.
The lack of control over message deluge is a fault of their own making, plenty of apps Twitter have killed that allowed users decent control over what tweets they saw as a priority, how they were organized etc.. But such user friendly functionality seems anathema to Twitter as it would stop the "impact" of their "promoted content"
AC as have to use Twitter for work purposes occasionally (far more work use than personal use, most of comments above relate to why personal use low, but some make work use more of a pain too)