Go5G Plus math -- is it worth it?

I've been exploring whether it'll be worth it to move two lines from Mint Mobile (currently \~$70/mo for unlimited data and what I'd describe as adequate service) to T-Mobile. The other benefits of T-Mobile (prioritized data, included international roaming, plane WiFi, scam block stuff, etc.) I'd say are worth about $30/mo *to me*. (Like, it's not worth $80/mo extra *just* to get my data prioritized, so I tried to account for the features I know I'd use.)

So if I switch to Go5G Plus at $150/mo, and account for the "value-add" of the various features (things I could see myself paying for otherwise), T-Mobile would be about $50 more expensive than Mint mobile.

So that $50 extra (this value depending how much the other features are worth to you) basically gives you device benefits. So let's think about the cost to pay for devices yourself -- say you upgrade to the latest iPhone on each line every two years. That's $1760 total (including tax), or $73/mo. And if you can get $350 for each old phone; that'd bring it down to around $40-$50/mo. About the same as that "extra" cost of switching to T-Mobile.

So *if* T-Moblie has trade-in deals which essentially let you upgrade both lines every two years without changing the $150 bill, then the cost is similar to Mint Mobile plus paying for the other stuff (device, international roaming, plane wifi, netflex, whatever) yourself.

But I'm getting stuck on two things:

1. T-Mobile isn't winning by a clear margin on value. There are various benefits -- but am I really going to max out my T-Mobile Tuesdays every week? So that's why I'm trying to put a number on what I think those benefits are worth. 2. My reading of Go5G Plus is that while they *say* new customer device deals will be available to Go5G Plus, those deals could easily say "get a free iPhone when you add a line and trade-in your device," in which case they're worthless to me (I don't need new lines), but still apply to new customers (new account means adding a line). Am I wrong?

I'm curious if I'm missing anything; potentially some other T-Mobile benefits I might not be aware of. Theoretically with an insider discount, the comparison would be more obviously favorable. (But with Mint, I take it I'd have to move away from that first even if I could get a code? Should I try to do this?)