Like I said, it's my personal opinion that using Utro alone does not shed the lining sufficiently enough - at least not for me, and I have personal proof of that. It really doesn't matter how healthy something is if there is a risk that the uterine lining is going to build up. There is also very real evidence that the Australian TGA also has concerns about it. I also have a friend in the USA whose OB/GYN prefers not to prescribe Prometrium (their version of Utro) because he also has concerns about it.
However, like I also said, it is everyone's choice to use what they prefer. This is how my body reacted to it, and everyone is different. So I won't be getting involved in any discussions or arguments about whether Utro is right or wrong. I use a progestin transdermally, so there isn't that much risk with that. I would honestly say that if you are going to use Utro, make sure you get regular scans or use a progestin maybe a couple of times a year to be on the safe side.