No UMD compatible is one reason why I haven't gotten a PSVita and still won't for a long time.
PSVita doesn't need a UMD drive to be UMD compatible. All that had to be done is Sony letting us get a digital version of our UMD content and boom!
I still think they should make some type of external UMD reader hardware you can plug into the Vita. --- http://i.imgur.com/Tk5qqZc.png "I dont combine the 3DS and LL together to inflate the numbers. I live in the real world" - Sailor Goon
they should have used cartridges for the first PSP.
That wasnt a possibility. At launch a DS game card cost manufacturers $20 for 8 megabytes ($2.5 per megabyte), whereas a UMD cost less than $2 for 1.8 gigabytes (less than $0.00108506944 per megabyte), that's a difference of 2304. A 512 MB memory stick cost $80 and that wasn't even enough to hold an entire launch game. To go with carts would have crippled EVERY game.