That's not the argument that has been made - quit changing the goal posts. Defense has not even remotely been brought up as to why Buddy should come off the bench. If it were, then the argument that he's on the floor to close games doesn't hold water.
The question was : "Is Buddy Hield satisfied with being a Klay Thompson?" in a larger context about whether Buddy is ok with coming off the bench - I pointed out two things: 1) Thompson is a starter, and 2) Klay Thompson is able to be Klay (don't dribble, just catch and shoot) largely because he plays with Curry. Given Fox is not Curry, are you really expecting Buddy to fully emulate Klay? And if you are, given point 1, why do you then expect him to come off the bench?
You then came with a useless (as usual) remark that if Buddy was 90% the player Klay was, this would not even be a question. By "this" I assume you mean starting vs not starting. In other words, your view is that Buddy Hield is so far inferior to Klay Thompson that he should not start. I then proceeded to give you their very comparable year 3 stats - a season in which both of them were starting, and you now counter with age as an argument. I don't see even see how age matters at all because we're not even discussing upside - we're talking about Buddy Hield being a starter, not Buddy Hield being a superstar. The Warriors won 50 games that year, and 67 games the following with Klay posting similar statistics (3 more ppg, slightly better %s). So fair enough, defense is a legit argument, though not one that has been brought up before in the context of starting or not.
So how about you actually substantiate why you think Buddy Hield's defense is so bad that he should not be a starter on a 30 win team despite putting up similar numbers to Klay Thompson who started on a 50-60 win team whilst playing alongside one of the best shooters in NBA history? And don't say "we're a 30 win team because he starts" because then that applies to Fox as well.