I can understand your concern.
You might want to get yourself a 3rd party digital temperature probe. I use one with four probes. One of the probes dis mounted on the rack near my cook to measure the cooking temperature. That is more accurate than the Traeger controller temperature.
One or more of the other probes can go into your proteins to monitor internal temperature.
For you cook temperature, set high/low alarms that will alert you if the temperature drops. For example if you are cooking at 225F, the temperature should stay between 175- 275F. If you open the lid to check the cook, the temperature might drop enough to set off the alarm, but it should recover.
If you are an Amazon Prime member, Prime Days are Oct. 11-12. You might just find some good sales on remote thermometers. While you are at it, check out deals on instant read thermometers. Look for one that reads in no more than 2-3 seconds.