yeah with running you need to take everything you read with a massive grain of salt cos so much stuff is anecdotal and the actual running "science" is absolute garbage science with garbage methodologies and garbage statistics (they invented a new statistical methodology because p values were too rigorous lol). but there was a study that looked at the peak impact force and total area-under-the-curve impact for a person landing on concrete vs asphalt, and the impact was something like ten times higher for the concrete. of course it doesnt necessarily follow that it does 10x as much damage to your legs or anything, but i think its reasonable to think that the difference has some effect, and it seemed like one of the less garbage running science studies to me fwiw

and just anecdotally, if youve ever been running on concrete sidewalks and then cross the road (especially a freshly resurfaced one) it feels like youre running on pillows

but yeah sucks if youve only got concrete or dogshit nearby, i have to do a fair bit of my running on concrete too and i hate it but thats suburbia yay. id definitely suggest trying new running shoes if thats feasible (theyre really fucking expensive and about the least ethical thing you can buy under capitalism though unfortunately). and resting your legs and letting them recover, all my experience of trying to run through shin splints has been that it just makes it way worse