Just going by the rules, what sort of things can we generate for a human TL20 universe? Most of the Makers are designed for the 1105 tech levels (TL 9 thru 15). Going beyond that thins out the possibilities considerably. How thin?
Armor. We start running out of new options as early as TL15. Not that we can't get newer stuff, but there's just less new stuff, and more stuff that's based on older stuff. BattleDress apparently tops out at TL19... unless we can use "Ultimate" as a stage, which bumps us to TL20. Oversize BattleDress at TL20. If certain armor restrictions are lifted at higher TLs, then there seems to be no armor "crisis".
Guns. Guns have a wider range, often stretching comfortably into the 20s. This is fine, since apparently warfare gets positively weird by TL24, plus or minus.
Vehicles. These range all over the place; the most advanced vehicles extend into the 20s, which seems to be safe.
Starships. More complicated than the Makers, starship design also has a lot of TL flexibility. New technologies are added, gradually, up to around TL18 or TL19. In addition, existing technology is rated by the ship's design TL -- so a TL20 laser's target number is 20.
Armor. We start running out of new options as early as TL15. Not that we can't get newer stuff, but there's just less new stuff, and more stuff that's based on older stuff. BattleDress apparently tops out at TL19... unless we can use "Ultimate" as a stage, which bumps us to TL20. Oversize BattleDress at TL20. If certain armor restrictions are lifted at higher TLs, then there seems to be no armor "crisis".
Guns. Guns have a wider range, often stretching comfortably into the 20s. This is fine, since apparently warfare gets positively weird by TL24, plus or minus.
Vehicles. These range all over the place; the most advanced vehicles extend into the 20s, which seems to be safe.
Starships. More complicated than the Makers, starship design also has a lot of TL flexibility. New technologies are added, gradually, up to around TL18 or TL19. In addition, existing technology is rated by the ship's design TL -- so a TL20 laser's target number is 20.