On the good side people could just be teleported into medbay if their metrics are out of bounds. Though probably teleporting a lot of people exercising or having sex. It would be a hilarious plot point
On the bad side, O'Brien could just teleport in a new copy of you from the pattern buffer of your last teleport when you die
Yes, he could teleport a copy of myself but I would still be dead then, my soul sipping tea with the interdimensional koala while watching my copy do all the stuff I no longer can.
Scotty is a genius and he was doing something that had never been done before. Continuously transporting himself to preserve the buffer. Not the same as just keeping a pattern in storage.
Besides, patterns can't be duplicated by a computer. It's not like a CD you can copy and burn. It's more like a vinyl record governed by the Heisenberg uncertainty principle
Okay, so the hypothetical is that the Enterprise is now equipped with 1000 transporters each cycling the pattern of one crew member... Except it still doesn't work anyway, because if the crew members are in transporter buffers they can't be out doing their jobs at the same time.
Okay, so the Enterprise installs 1000 transporters, enough power systems to run them all continuously, goes to the Thomas Riker planet, waits for a freak weather storm, duplicates the entire crew, puts all the duplicates in transporters, holds them there as backups.... And then all of the transporter clones die as soon as there's a battle and an EPS relay blows.
That's not how the Federation does things. They're the good guys.
Just because they aren't transporter purgatory bad, doesn't make them good.
The federation has unintentionally done and continues to do real irreversible harms. They also do good intentionally. There aren't a lot of examples of experiments being set up in a risk reducing way...