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Hi @leol - this is true. T-Mobile One would be slightly more with the current offer ($140 for 4 lines), and you loose the ability to stream at HD resolution. T-Mobile One only streams at 480p unless you add One Plus or One Plus International. The One Plus add HD streaming, LTE tethering (I've gotten as high as 30Mbps) and a few other extras, but does cost an extra $10-25/line. See if it's a good match for you as it could add up.
Check your plan as well - do you get charged for over 4GB data or just de-prioritized? If you just get de-prioritized, the trade-off is unlimited LTE data vs. HD streaming...recall that if you go over 4GB, you could be throttled during congestion...but with T-Mobile One, that limit is 50GB! (I've never hit that high ever)
Also, think about the fact that 480p vs 720p on a small screen is really not noticeable. I've not done a lot of tests, but general consensus is that it's not that important.