I agree with you, alone it isn't a factor, but it's not alone. I think though this issue of maximum ordnance capacity will be addressed though whenever the perked ordnance system is initiated (which is believed to include perking some of the lancaster's heavier loadouts as well).
i cant really see a reason to perk the b29 tho.
-its climb rate is very slow (i believe people were saying it takes 60 mins to reach 20k?) even with 50% fuel it will be a slow climber, much slower than say b17's and b24s. i think this will nock it out of the running for quick responce bombings on close bases. you'd have to launch these from a much farther allied base to rise to an appropriate hieght, pretty much you could have a b17 to atleast 10k and doing its bomb run before you can even get the 29 level at 10k.
i see the b29 become 4 things.
1. a major city attacking aircraft.
2. an HQ bombing aircraft
3. a low alt-carpet bombing gv planes.
4.used by score hores who like to up in bombers and just randomly bomb towns to score bomber points.
-armament. this may be a reason why it deserves to be perked, but why? it only has 1 20mm i believe in the tail (same as the betty) and it has no nose or waist guns. so if you can line your plane up right, the b29 will be easy to HO or strafe from the side without being in the line of fire. so its an allmost equal trade off. the b29 will be suicidal to attack from the rear,top, or bottom. but vunerable in a HO or to the sides.
-fuel. this may be the only reason the b29 gets perked is because of its MASSIVE fuel option. but does the WHOLE bomber deserve to get perked just because of its fuel? no. maybe perk the option to change fuel above 50%, but dont punish the whole bomber for it.
-design. the B29 is a BIG target, it shouldnt be hard to hit with flak/field guns. and wirble pilots will have a field day when they see a b29 coming in to low-alt bomb. the bombers big enough to fill up there gunsights. so it doesnt deserve to be perked by its structure.
-performance. the b29 is a very good bomber, and is will have the highest ceiling count of a bomber in the game. but does it really deserve to be perked for that? since its climb rate is SO slow. it would take possably an hr to get it to its max ceiling alt. and if someones really gonna waste that much time to climb that high to avoid fighters then you know he isent a very good bomber pilot. (but i fear if the bomber is perked, you'll see alot of ppl doing this thing. because they will be too scared to lose there bomber points).
just my $0.02, theres nothing i see that makes it need to be perked. and certanly not the 400-500 perks people are asking for it.