If it is true that...

Founders should be cautious even when potential series A investors have great reputations and work fast to provide termsheets

and

Having one founder take fundraising meetings avoids real-time negotiations

Then it must be true that...

Investors are professional negotiators and can negotiate on the spot very easily

If it is true that...

Having one founder take fundraising meetings avoids real-time negotiations

and

Investors are professional negotiators and can negotiate on the spot very easily

Then it must be true that...

Fundraising can be demoralizing when investors reject you