We may have slightly different scenarios in mind, but... If we assume a single exit-only lane and the rest of the lanes are through-only, then... yeah, maybe the rightmost through lane would be better served that way. Depends on the situation
I'll give you a similar example that I use every day going home from work. The details are a little different, but bear with me...
This is southbound I-135 at the Kellogg interchange.
Black lines = I-135 SB through lanes
Blue line = Accel/Decel lane from 1st-2nd Streets to Kellogg WB
Red line = 'Normal' path to go from I-135 SB to Kellogg EB (my route home from work)

At rush hour, the ramp to Kellogg WB is often backed up, enough that the tailback frequently bleeds into the rightmost through lane of I-135 SB. It also makes merging onto I-135 SB from 1st-2nd Streets rather... ummm... exciting. The I-135 SB to Kellogg WB is a very heavy movement here during the afternoon rush, much heavier than than to Kellogg EB and probably fairly close to I-135 through-traffic.
It's quite common for drivers going my way (to Kellogg EB) to use the red line below instead.

They use the
middle through lane until the last possible second—bypassing all the drivers stuck waiting to merge west—and then jump across the rightmost through lane into a nearly empty ramp. Occasionally, they have to slow down to around 35 or 40 mph to do it, but I assert that it's no more dangerous to do that than add their car to the congestion mess, where further slow-down could result in a rear-end collision on I-135. Some other drivers even do that 'modified' red line path and then merge into the blue line path once on the two-lane part of the exit ramp. Sometimes that means I have to slow down quite a bit, because they have to slow down quite a bit in order to merge west, but I'd rather have to do that than have the lane change happen on the interstate mainline.
OK, so that's all really confusing. My main point is that maybe the through lanes are better used to store exiting traffic if exiting traffic is substantially congested.