Just how many games do you except to have essential patches?  If a game is patched for online, then it won't matter because once the console isn't supported online won't work anyways.  If it's bugs and glitches then yeah, but unless it's like Skyrim where those patches actually made a noticeable difference it'll pretty much be a non issue. 

Of all the PS3 games I still own, out of over 100, the only ones that have any day one patches or patches that include extra content, are Dark Souls, Sleeping Dogs, Twisted Metal, and Test Drive Unlimited 2.  TDU2 added 13 DLC missions which are drive from this point to that point in this amount of time, the others are day one patches that are probably perfectly playable without the patches installed.   

That is true, but since PS4 is gonna be my console for all my multiplats and adding all the exclusives Ill probably have 70+ games for it by the time the generation is over (that's what I'm at for my 360 and I got all my multiplats for that last gen).  I just don't wanna be in the position that I'd have to pick and choose which games to keep and which to uninstall.  

Some of the patches the PS3 received with games like Skyrim and Bayonetta were because the PS3 getting poorly developed ports.  You won't get those patches on the PS4 since it's the more powerful system and it's just as easy to develop for as the Xbox One this time around.  The only patches you'll get, and like the PS360 this is rare, are those devs that patch games day one.  Assassin's Creed 4 has a 1080p patch for the PS4, otherwise it runs the same resolution as the Xbox One.  Same with Call of Duty Ghosts.  Do those two games really count considering the patch is to increase resolution above what the Xbox One has and nothing more?  I think they conveniently forgot because Microsoft wanted all games to have resolution parity and everyone else said f that, so no one else does it now.   

PS4

1. No

2. I believe it uninstalls the patches as well

3. Seconds. In fact i havent noticed any install time on the PS4?? and I've played quite a few games.

4. No clue. But looking at comparison vids..it seems Xbox One takes minutes to install. In the extreme cases some games takes over an hour -_-

I believe that in the future updates this issue will be resolved and you'll either be able to keep your patches, or export them to an external drive or PC.

i can only answer number 3. and i can say installs are really quick.

On average PS4 is faster than Xbox One installs.

I got an X1 and the install depends on the game. Forza took me a long time, like 2h or and I could play only after an hour. Dead Rising took me a long time too. But I heard MS will release a patch for games so they install faster.

Ps4 games install very fast which allows you to get into the game quickly. Only bad install I have seen was MLB 14. That game won't let you do anything until it is fully installed and that took almost an hour.