What are your thoughts on Vienna Side Reins?

I don't really like them cause even though I understand it helps when lunging and stuff so horses don't put their heads up in the air, I don't think they can really stretch or shake their heads around. I have used them in the past and when i took them off my horse would stretch soo much and shake her head and all which made me realise she couldn't really do that before, even though I had them on pretty loose!
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