Homebrew variant Warforged with NO attribute cap?
EDIT: *Ability score, not attribute.
Hey folks!
Hoping for some feedback on a new Warforged homebrew variant themed around the concept of a blank slate robot designed for adaptation.
The lineage would get most of the same Warforged features: constructed resilience, sentry's rest, integrated protection (no AC bonus), specialized design. However, they would not get any Ability Score increases. Instead, they would have no level cap on ability scores. They could continue to increase their abilities however high they wanted with no max, at the same rate of +1 to modifier per 2 levels.
Additionally, they could also increase their ability scores beyond 20 with magical items that normally do not allow this. To do so, the magical item must be integrated into their design, similar to integrated protection, taking one hour to do so, in addition to any attunement time. There would be limits on the number of magical items which could be integrated in this way, and items which are not integrated cannot increase ability scores beyond 20.
Assuming standard array and that the PC dumps all 6 ability score increases into one slot, the max a PC at lvl 20 could achieve is a 27, which would be a ±8. This honestly does not feel that overpowered to me, considering proficiency bonus is already +6, meaning for a proficient roll the Warforged PC is rolling a +14 vs a regular ±11, which is only a ~27% increase. That's basically just advantage.
Thoughts on this? Overpowered? Any balance tips welcome.