For whatever reason, it seems like 6'3" and 6'4" are better heights for goalies than 6'5"+. Out of the top 10 goalies in the NHL, I think Oettinger is the only one taller than 6'4"
NHL.com Top 10 Goalies:
10. Linus Ullmark - 6'4"
9. Juuse Saros - 5'11"
8. Jake Oettinger - 6'6"
7. Sergei Bobrovsky - 6'2"
6. Thatcher Demko - 6'4"
5. Ilya Sorokin - 6'4"
4. Jeremy Swayman - 6'3"
3. Andrei Vasilevskiy - 6'4"
2. Connor Hellebuyck - 6'4"
1. Igor Shesterkin - 6'1"
Big goalies are great, but huge goalies, maybe not so much. You can argue that 6'5"+ goalies are a bit rarer in general due to the fact that it's simply a less common height in the general population.
Joshua Ravensbergen is an interesting draft eligible prospect. He's 6'6" and has a career 34-5-5 record in the NHL. But his save percentage is just fine, as is his GAA. For very large goalies, I think health/durability is a factor that has to be taken into consideration.
And in case you're wondering, Flames prospects Arseni Sergeev, Yegor Yegorov, Kirill Zarubin, Daniil Chechelev, and Waltteri Ignatjew are all either 6'3" or 6"4.