Why war expert John Spencer thinks Operation Sindoor was a signal, not a destructive act

Chair of Urban Warfare Studies and US military veteran John Spencer, who was in India recently and interacted with top military leadership and defence tech entrepreneurs, claimed that Operation Sindoor was more of a signal to Islamabad than a destructive act, as India chose to use precision-guided munitions against select targets in Pakistan.
In a recent interview with the news agency ANI, Spencer observed that India was demonstrating that it has the will to do what is necessary if Pakistan wanted to continue to escalate the tensions.
The expert, who in a recent social media post pointed out that the operation demonstrated India's shift from a reactive posture to a proactive, precision-oriented doctrine, said there has been a change in India's strategic doctrine, which, according to him, will change the entire region.
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He claimed that India achieved its strategic goals at low cost, and in doing so, has changed the security paradigm for the region.
Backing Deputy Chief of Army Staff Lt Gen. Rahul R Singh, who had said China used the India-Pakistan military conflict as a "live lab" to test its various weapon systems as Beijing is Pakistan's biggest weapons supplier, he said the conflict was indeed a testing ground for China to test its various defence equipment.
When asked about the recent visit of Pakistan Army Chief Field Marshal Asim Munir to the US, he said he does not think the US is going to supply any weapon systems to Pakistan any time soon, and they will have to look somewhere else. According to him, the current US administration is not going to support those who back terrorism.
Defence