Former Director of Central Intelligence James Woolsey seems to agree with former CIA analyst Larry Johnson, and former Mi5 officer Annie Machon, that the recent claims from USA intel agencies, and James Clapper, are being presented in a manner that strongly implies that there is no evidence to back them up, and they discuss in detail why, here:
https://youtu.be/NTwLPVp-hjk

One of the highlights from the discussion:
https://youtu.be/NTwLPVp-hjk?t=1490
- "17 agencies agree" is a misleading statement, as most of those agencies are non-participants in analysis, or conclusion-making, and have no role in the discussion and making of intel estimates
- that claim has been reduced from "17 agencies" to just "3 agencies"
- the Defense Intelligence Agency and State I&R are central contributors to intel assessment, but were excluded from assessing the validity of Russian hacking claims

It's also stressed in the discussion that James Clapper is a proven liar, without credibility on this subject.