As the proud owner of 2 therizinosuars I can tell you this

These things may take forever and alot of resources to tame but they are worth it

1-they do over 100 damage per attack

2-they have lots of hp

3-they are easy to find

4-they tear through literally everything that tries to attack you

5-they can tickle all the rockarrots and other crops out of bushes(like 20 rockarrots from 1 jungle fern)

These literally made a spino disappear in front of my eyes

So that's why they are worth taming hopefully this helps