Birding in Singapore Using Laser Dot Sights

Laser Dot Sights or Red Dot Sights were originally invented for use on high powered rifles to assist with accurate aiming. It has been adapted by wildlife photographers for use with super telephoto lenses.
Do you need a dot sight for birding? How does it work?
Is it useful or just a waste of your money?
Watch my explanation in full 4K. Set to your highest video resolution for best viewing.
If you feel my manner of talking a bit slow, set your playback to 1.25x.

EDIT: I have an update to this video at this link:-
   • Birding in Singapore. Using Dot Sight...  

Video shot in 4K with the following:
Sony A7RII
Nikon D500
Osmo Action
Osmo Pocket
Background music by bensound.com
Sokani wireless mic.

Links to some of my other Birding in Singapore series:
Dairy Farm Nature Park    • Birding in Singapore - Dairy Farm Nat...  
Sarimbun    • Birding in Singapore - Hidden Gem #1 ...  
Bukit Brown    • Birding in Singapore - There are real...  
Pulau Ubin    • Birding in Singapore - Pulau Ubin #1  
Bukit Batok Nature Park    • Birding in Singapore - Bukit Batok Na...