The bid helps transfer pressure elsewhere. If Italy is unnerfed, it can take the oil, help with sealion, ward off America, defend Germany, and contribute a nice stack of 2+ armor and 6+ mech to punch through the Russian line. If Italy has an airforce (which will be dead if it gets forced into an attritional counterattack), it will be killing Russia too.
If Italy is strong, UK cant put a base in Iraq/Persia, because Italy will own that. If Italy is weak, its troops get cut off, no amount of German help will eff. hold the mehgrab/levant regions and the UK can focus on other things.
That is why the bid is a game changer.
Tirano and I discussed putting all the way up to a 38+ bid on the UK home fleets or France but there are few (better) ways to re-work the entire starting scenario than by putting UKs odds way up to hold/take/boggle the med, which only takes 18+ish.
Still, there is no definitive answer about the effect of many artillery (4-5) you could place all over Russia that, over time, would make it impossible for the German endgame stack to stand next to Moscow (lest you attack it with 10+ arty). No one on the boards uses the bid this way; the reason is that Russia may or MAY NOT be in the war from game start, so if you add a bunch of extra stuff to RUS it may just sit there for a while whereas UK stuff can always have a new influence on the game from UK1.