Many classes have rewards for being pure. Scaling bonuses as you progress are the reward for this. As you progress in level, you get improvements to abilities. Disable and Search do not scale and are driven by skill points. You either succeed or fail when you use them. More importantly Skills in general are not working as they should (and not working as they do in PnP). For example, your skills should be capped (unable to progress) at your classes level. Currently, 1 rogue level enabled you to train to max all skills. Given the mostly useless nature of many skills, it enables one or two levels of rogue to effectively perform on equal footing as characters who have invested more levels. This is not the same with most other classes.
When you compare two characters, one a full rogue with another who has a few rogue levels, you should see a difference in their performance. Imagine if you could take 1 wizard level and put skill points into some Spellcasting skill to make spells as useful and as effective as a level 16 wizard's. I think this comparison is appropriate. Granted, Rogues can do other things and have other roles, but if we're talking about improvements to base rogue abilities and reduction in search/disable timers, we should strongly consider leveraging rogue level for this.
I know there are plenty of part time rogue builds that aren't full rogues, that's fine, you still get to use your +15DD/Search items and disable any trap a full rogue can. But, please see the logic in allowing a fully dedicated rogue to perform those actions more effective than rogues who basically picked up a copy of "Trapsmithing for dummies"