There is no proposal so far about trying to evaluate the difficulty of each combination (like 4T+3T+3Lo) and no proposal to eliminate the penalty for sequences (like 3A/half loop/3F )
Actually there might be.
Note the proposed change to Rule 510 in Proposal 266.
In a jump combination the landing foot of a jump is the take off foot of the next jump. . . . If the jumps are connected with a non-listed jump, the element is called as a jump sequence. However half-loop when used in combinations/sequences is considered as a listed jump with the Value of a Loop.
With half-loop considered a nonlisted jump, as has been the case to date, 3A/half loop/3F was considered a sequence, subject to the 0.8 multiplier.
If this proposal passes, it appears that half-loop will count as a single loop jump and 3A/half loop/3F will be considered a three-jump combination, 3A+1Lo+3F and earn full credit for all three of those jumps, or also be subject to the bonus 1.1 multiplier if proposal 183 also passes.
Other sequences, e.g., something like 3F/tap toe/2A, would still get the 0.8 penalty.
I believe that the reaosn the ISU is reluctant to reward combinations more is because a combo already carries a built-in bonus -- the skater can squeeze in an extra triple and use the extra jumping pass for something else. Plus, a combo allows you to repeat a jump and still stay ahead of the Zayak rules. So there are other benefits to combos than just the base values.
I assume that was their reasoning.
Still, I think it would be better to give full base value for sequences and a sizable bonus to the second (and third) jump in a combo.
I tend to agree.