I've not had enough experience with tips for these newer Weller stations yet. The MX SMD pencil tips cost but the iron tips are under $10. The cheaper Wellers I've seen lately are made in Mexico but the WX and WD series are made in Germany so my bet is the tips are fine. I've had a Weller WESD51 on the other bench for over a year now and that's been fine also. Still using the original tip which gets a lot of use and gets left on for long durations. Don't know where it was made as there is no country of origin marked on it.
Weller's tips are made all over the place. LT series for example are made primarily in Bosnia (seen one from Japan). NT series is made in Japan. RT series are from Germany though, so I don't have direct experience (seen a review that indicated they bend FWIW; not sure if QC issue or improper use/abuse).
Even their German made stations have had issues however (WD, WRM, & WX), and from my perspective, it's due to the rules regarding the "Made in Germany" qualification (20% content or significant transformation) that allow them to cut corners and still qualify.
Mine for example (WD1), at least the power board was manufactured by an OEM in Asia.
Pics of mine can be found here. Other threads cover the issues.
It's not garbage by any means, nor am I looking to dump mine. But Weller isn't what it once was in regard to reliability or QC, tips included IME, and are being bested by the competition as a result.