Monster scaling really doesn't mesh well with D&D without being super immersion breaking, IMO. Would really enjoy being level 5-10 and a mere goblin is actually a challenge still? A kobold? D&D has a massive enough repertoire of monsters at every CR to avoid having to go the level-scaling route. I can't stand level scaling...you can never feel powerful even to the smallest weakest of monsters just because they scale with your level. To me, that's taken all the fun out of the game. I would much rather then substitute in higher CR monsters than scale low-level fodder.
