Sealed (Conditioned) Attic Space - Pros/Cons

It’s seems to be the best option for our climate zone as long as it is done right. I’ve researched it quite a bit because I’m about to start a new build and will be doing a conditioned attic. Some builders will not do it because they had to warranty homes that were done wrong when spray foam was first coming around. Here is what I’ve found: home needs to be very tight (air sealing), need to bring fresh air in from either an ERV or ventilated dehumidifier, need to add dehumidified supply air to attic someway. I plan on using an ultra-aire style dehumidifier with a fresh air intake and having a 2” supply hole to provide the attic with fresh dehumidified air (in addition to most of the dehumidifier supply air being plumbed in hvac supply trunk line). If you don’t account for that then ridge rot can be a problem. I’ll be doing open cell on the roof deck. Also need to think about outside areas that are under the roof (carports/porches). Those will either need some form of blocking between the rafters to create a backing for the foam (if leaving those areas outside of the building envelope) or you will need to spray the ceiling joists and rafters to create a complete envelope. If I were doing it on and older home, then see if the roof needs work/replacement first and if replacing then pay a little more for ice and water shield in high risk areas (eves, ridges, rakes, etc.)

What company did it and how much did it run you? Wondering if this might be something I want to try and tackle next year.