My 2018 13" Pro is getting long in the tooth and the battery is holding less and less of a charge. Also, not sure how much longer it'll be supported by new iOS updates. I use it mainly for content consumption, web browsing, email, light document work, etc. No heavy duty video editing or gaming. Would upgrading to the M3 Air get me any worthwhile benefits? Or should I just look at getting the battery replaced on my Pro?