I don't necessarily mind it. Battle powers represent the amount of Ki someone has and clearly don't scale linearly to raw force/strength measurements or tnt energy outputs. For instance, it takes millions of more energy than the human body can output to match the level of city levelling nukes on the tier of Piccolo Daimao, yet 1st form Freeza's battle power is only 106,000x that of a regular human and he's a casual planet buster. Battle powers and multipliers clearly aren't something that scales coherently to general measurements, beyond Kaioken which is explicitly stated to multiply attributes such as strength, speed, general senses, etc.
The only main problem with a level as low as 10 is trying to fit all the characters weaker than Goku but stronger than an average human into that range with even a decimal point of difference becoming a big deal. However, I wouldn't say it's unfeasible when talking about a hypothetical part 1 scouter list when considering many of the levels at the start of Z don't match up numerically with statements made in Part 1.