I agree.
1st to 9th get 3 partial advances and 1 ful level up = 4 x 9 = 36 levels, plus a zenith feat in 2e at 10th = 37 and it's one level per session.
I loved 4e at the time, especially the addition of encounter powers and spells, but was fully ready to shift to 13th Age when I discovered it during its playtest. Each class having its own structure was a big plus and taking away the battle grid is something I didn't think I'd like initially...
Foundry VTT has a really good implementation module. It's got the content of 13th age core, 13TW and the first Bestiary. Character sheet builds easily too.
This is the best looking adventure I've ever seen. Ordered the hard back in high quality. Now I've been heartbroken to find I cannot renew my 2 years expired 4th Edition subscription.
Thankfully Ash Law made a very good post on how to convert encounters...