Why not wait for an investor to say, “I love your company, but I hate your vesting terms,” and revisit the issue then? Because, amending your founder grant at that point means you’ll not only pay legal fees, but you’ll open the door to renegotiating your entire vesting schedule and terms with your investors—at a time when your bargaining power may not be ideal. You’re about to get $5 million from the investor. You think you’re going to tell them no thank you, you’re not okay with that vesting term? It’s far better to set up a reasonable vesting schedule (which may or may not include acceleration) in the beginning, so that when investors come into the picture, they will be less likely to require amendments.