I work at a great small startup. I'm the only person in my position which involves the look and feel of our product. I am positioned when we grow to lead a team that will work on these things with me. It's the primary reason I work here because I want the future team and want to utilize my leadership skills and I have ownership over a product.
Lately I've been getting slammed with a lot of work that only I can do, as I'm the only person working on my portion of product. I found a lot of work I was receiving could be avoided because it was too soon to begin projects as they weren't well thought out or it was unnecessary for MVP and I have too much on my plate. I voiced my concerns, admitted I was too gun-ho to please the ideas and suggested we spend more time considering options and concepts and less time diving into them (because I get stuck with that part by myself).
I told them I was overwhelmed and I find that I'll end up re-doing a lot of work because we didn't take more time thinking things over. I mentioned that if I work late during crunch time and always working late then nothing is crunch time. It was for the most part, understood and moves have been made to lighten the workload as well as taking my suggestions when I say "That's not necessary for now".
I do feel like I'm now a bit of a downer, but I feel it's necessary to keep focus even if I'm no longer winning favorite team member points. However I still get a lot of comments related to product I feel are unnecessary such as "Why don't we do X" or "Don't do X, Y would be better". Sometimes these are valid points I take underway or other times and I'll reply "Good idea, but let's table it until I do X and Y" if I feel it's unnecessary. Sometimes it's not always accepted and I end up doing the work which is fine.
My real issue falls on when it's really arbitrary stuff. Particularly one employee is pushy (and is not my superior, mentions they studied something similar to me in the early 80's, though, it's not what they're hired for. It's what I have ownership of.) who will really push on issues "X doesn't make any sense, it should be Y or Z". Sometimes the Founder will reply "Good point, we can change that". This will be sometimes be about something minute such as an example for engineers. I will voice the insignificance of the problem which is sometimes accepted but I can't shake the "He doesn't want to do it" vibes coming off of a few people (and hey, sometimes I don't, but if my engineers tell me they get the point that's good enough for their purposes).
Other times however, it'll be insisted upon and it makes me uncomfortable. I'll say something along the lines of "I have A, B, and C still pending, where does New Idea X and New Idea Y come in on the priority list"? That's on a good day. Other days I'll sort of sigh and say "If you think it's necessary, I can do it." I try not to do that, but that's my reaction sometimes. It's usually because I'm agreeing to something I feel I shouldn't have to.
I think the worst thing I do, is if I'm really adamant, I'll say "I disagree, it's just not important right now, I still need to do X, Y and Z. We can revisit this another time". I say something like this when I know I'm being diverted down a path that will have a large negative impact on time management. This tends to come out when I feel overwhelmed by others opinions Even 3 hours wasted on something really arbitrary can be a big loss.
I get testy because I am the lead of my "department of one", I want to show I know what I'm doing but I'm limited by time and resources and trying to make the best of them.
What are some ways I can navigate this situation better? I want to come off more optimistic and less annoyed.I have pointed out some of my replies are better than others so feedback on the more positive ones would be helpful to improve upon them.