i think its just every one has excitement with the new breeds, i myself is having a hard time finding friesians

No they are not retired, but they are a rare breed.  Akhal-Teke horses can only be purchased from the foundation store on the 17th of each month, they are not available if it's not that day.  Likewise they can be found in the wild on Hoofbeat Plains on that day, but no other.

Additionally since they are a rare breed, they are subject to breeding restrictions such as only being able to breed once they've hit level 25 and they have a limit on how many times you can breed foals from them.  You can read more about their restrictions on their wiki page here https://horsefable.wiki/akhal-teke/

They also aren't the only rare breed on the site there are also the Marwaris, see their page here https://horsefable.wiki/marwari/ for info and the Chincoteague ponies, see their page here https://horsefable.wiki/chincoteague/ who cannot be bought in the store at all, see their page for ways to get them.