That's just what I've been doing after deleting Instagram from my. phone. I can't trust my evening dopamine-seeking behaviour with the phone app, but there's much much less stickiness in the browser.
Yes, it does help. But it's too easily switched off. I basically have to be my own worst enemy I have to order to prevent myself from being my own worst enemy!
Have you tried just not using a smartphone? I have a flip phone I take with me and leave my iPhone at home for things that need it. Otherwise, I carry my laptop/tablet everywhere. If I need to check my social media or email I have to sit down and deliberately do that
I've been resisting this for various reasons. Parking apps, maps, camera, podcast app, many many timers, and banking apps are all phone functions I use quite often and I can't see obvious ways around them which don't involve lots of other gubbins which I will inevitably lose or forget.
I could possibly uninstall everything but the absolute necessities on a smartphone for when I need it, and otherwise carry a flip phone. Maybe use the flip phone for tethering so the smartphone doesn't need a Sim card. But it seems that might be introducing lot of extra stress into my life, especially for stressful jobs like parking before a meeting, keeping up to date with clients, etc