There are several ins and outs here.
To start with, Appropriations is seen as such an important committee, that if you have a seat on it, that is the only committee assignment you can have. A lot of these enthusiastic freshmen want to impact on a half dozen or more committees, so they can try to dismantle some of the most abusive federal practices.
Appropriations is also “skilled work”, in that unless you have a lot of experience and a practiced staff, pouring over a budget bill as tall as you are is a daunting task. Now imagine pouring over a dozen such bills.
The one big advantage, and it is a big one, is really up to the chairman of the committee. This is to *reorganize* the budget bills, to “separate the wheat from the chaff”, and put the wheat in one bill and the chaff in another bill, which can die for all you care.
Bottom line: These people are busting their humps, and it is not going to stop for a long time. They are strategizing like chess players, learning truly arcane parliamentary procedures and the rules of the House, and jockeying for position all over the place.
We need to cut them some slack, and just hope that they can pull it off.