L14 Gen5 or ... ?

Small intro - thus far I have had a few laptops - Siemens , bunch of Asus-es, Acer , and couple of Ideapads (Z410 and L340)

As for siemens - video card burned out. Asus-es just stopped working (did not figure out why) , Acer and Ideapads suffered destruction of cases. motherboards e.t.c. are still going (although Acer and Z410 are just way too outdated)

few days ago , both - charger cable and corner of LCD on my L340 broke.

Question: Would L14 Gen 5 provide better longevity case-wise ? I have heard that some Thinkpads have metalic case , however, reused plastics kind of scares me from spending money on L14 , when I could get some Zenbook or Vivobook with same or better specs for less.

Locally I can see only 2 L14's : 21L5001LMH and 21L1002MMH

This laptop is intended mainly to be used for university( however, I do sometimes , run all-core computaions on my laptops (image/data processing in C++) or run 3D CAD and I often have to open pdf-s with 4GB+ in size

It's also been quite some time since I have used integrated graphics. Currently when docking my L340 (with GeForce GTX 1650) to 4K HDR monitor, graphics seem to get a bit jitter-y. Will L14 be able to even handle external 4K monitor ?