I really want to echo @taliv input again since you have gotten some other perspectives.
Based on my experience, things that rigidly attach the rifle to the tripod, such as saddle or ARCA, are slower than putting a stable sandbag on your tripod and using that as an interface. When I say slower, I mean slower to pack and unpack, slower to transition between rifle and binos or rangefinder (it's nice to use the tripod as a stable platform to scan, laze, or spot for your buddy), slower to scan from target to target, simply because you have the added step of tightening and loosening. In terms of being able to leave the rifle on the tripod unattended, if you have a good tripod and a good sandbag, just rest the rifle's center of mass in the sandbag and it's not going anywhere.
Setting aside time, from a position stability perspective, I would say that rigid attachment is different, not better than, using a stable sandbag atop a tripod. With rigid attachment, any vibration or movement of the tripod is transmitted without dampening to the rifle, whereas the sandbag will smooth some of that out. Again, strictly from a shooting stability perspective, both can work but the technique is different.
My opinion only: maybe rigid attachment works or is even ideal when you have a great deal of time to set up, but I prefer just a sandbag for any time limited situation.
Another thing: good tripods are light because you don't want to lug around a heavy ass tripod all day. But when shooting, you want it to be heavy. It's typically not a problem if you are shooting a 20lb+ bolt gun, but if shooting an AR or similar, hanging some weight from the apex once deployed can add to stability.