i agree with "go for it" for 7k but I disagree with "any one benefit with DM" is 'worth' 7k

yes benefits wholistically are worthwhile but 7k worth is debatable (how do you assign value to F-lounge, for example?. or the fact they answer your phone in 1min instead of 3minutes. Either way value is subjective. it's worth 1k or 10k if you travel every 3 weeks after you make diamond on economy class, but if you travel every month on paid business class not sure how much the incremental value is 'worth it'.