I agree that even at full speed the first one is a pretty bad miss. I am surprised that he missed it. He was in good position, unobstructed and looking right at it. Pretty clear PK. Once the VAR alerted him, I am shocked that he still didn't give it upon watching. THIS is not a VAR issue. This is a CR issue in my opinion.
The second one... I agree that I'm not convinced this is as clear. Even the VAR had to look at it repeatedly. Several speeds/angles had me wondering if it had any impact on the play as the player appeared to be over running it and stopped trying to back track to the ball. I can understand a no PK here.
My original opinion on VAR remains. VAR should ALWAYS be at full speed to the CR and probably for the VAR's. If it is not obvious at full speed then it is not a clear and obvious error. Once you start applying only the opinion of those in the booth eliminating the CR from the equation, you are applying two different standards. Many decisions are ITOOTR and you will have made it in the opinion of one of multiple referees with only one needed to carry the day. You could slow down a majority of challenges for a ball at a professional level and find some pushing, holding, shirt pulling, etc. Much of it is trifling or accepted at this level. Once we start applying a standard of frame by frame in the PA and awarding PK's for anything resembling a foul (as we saw in the WC), we have different standards and subsequently a mess in my opinion. I believe the CR needs to always carry the decision as their tolerance/opinion has set the standard for the game. I think we all know very good referees who have a different level of tolerance from other referees... It varies from referee to referee, game to game, etc.
First on is a terrible miss imho. Would have to be a failed assessment IMHO.