There are lot of projects today that doesn't follow what is on their roadmap because plans may changes as many projects do fails. To me what that is mostly important in premarket (I can assumed you are talking of about their pre-sale) is that you must look after the team their years of experience and how well have they been Good in other crypto related projects, as most of them claims what they aren't so it's good to make further findings especially knowing their co-partners and investors is also very good. Again, you can also look at the circulating supply, Total supply, teams allocation and as well as allocation for marketing, including their usecase and prospects. All these constitutes to knowing how a project could becomes successful.
I think it is only okay to change plans or what is not written in a road map but I think that is not the case that happens to most projects. What happens actually is they only put promising plans on their road map only to attract a customer and they will abandon the project eventually because they already get what they want.
In terms of planning, we have this so-called "Plan B". It would be better to indicate it when creating a road map, so that people still knows what to expect if in case the "Plan A" is not followed. If a project can lie, it can be almost all around but when it comes to supply, I think this is something that can't be faked out, though this can still mean nothing if the other is not well.