The reason you want to be wary of turning of tROAS is that you are removing any guardrails for Google to work within. This means that they could easily try to get you a 1x or 2X ROAS just to spend your full budget.
If you wanted to take off tROAS, what I would recommend is actually looking at how you can improve your numbers in the ad account first:
* Make sure your ad account is structured to leverage automation around bid strategy to let Google do what it is good at. Making sure there are not to many or to few campaigns where automation is limited where it makes sense
* A/B testing ad copy and shopping feeds to improve your CTR to capture your ideal customer, which should lead to more quality clicks if you are going after the right people
* Make sure the site is removing friction and calling out why people’s objection to buy are answered
Doing the above 3 and other work means that if you take off tROAS and you do see a drop in ROAS. It won’t be as bad as if you did it right now and saw a drop in conversion rate. Improving pre and post click metrics to hit a better conversion rate can make scaling a lot easier.
If you just scale right now and only have an ok ROAS, you will likely see your conversion rate drop dramatically and unless you want that, you can be become very unprofitable quickly.
We saw a brand we pitched have this happen to them back in October when the agency just increased budgets to scale and didn’t work on improving pre and post click metrics like we told the potential client to do first.