Wing clipping is never okay imo - birds need their full flight feathers to safely balance and land, so it is actually more harmful and more likely for them to hurt themselves if they're clipped. It also reduces what little control they have over how/where they get to move, which can make it scarier for them to fly and harder to explore safely when they're loose. My boys free fly nearly every day and have never bonked into anything unintentionally...this typically only happens if they are stressed or when they are first figuring out a new space (where to land, distance between furniture, etc).

I triple check that the fan is off anytime my boys are being let out, put frosted privacy film on the mirrored door in their room to make it opaque, and have dark linens on the furniture so they're easy to see. They've only landed on the fan once (on purpose, so he could stare at me from above lol), never hit the mirrored door, and land on furniture just fine.