[Andrew Musau]

Specifying a base category for categorical variables does not affect the treatment effect. However, if you mistakenly omit more variables than necessary, it can alter the ATE coefficient. Therefore, I would suggest ignoring this issue, as you mentioned. There is no benefit if your only interest is in the treatment effect, and the downside is that manual exclusions may lead to incorrect estimates.

[Matteo Pinna Pintor]

Yep, perfect, thanks