I have a self seeded Sycamore in the garden. It's probably getting on 15 years, it's large. And it's rather beautiful. I have wisteria rambling all over it. I get lots of joy looking at it. My neighbour has one (probably the parent) that must be getting on 30-40, it's a beast, it sprawls our garden, it sucks the living daylights out of everything. It doesn't feel particularly appropriate, a limb snapped off and flattened a shed. At the same time it holds so much wildlife. As for our chance sycamore, I'm going to pollard it next year. I have many trees that may be classed as inappropriate, but with the Internet and what not, asking people, studying the site, you can try and work out what works and what doesn't. I wouldn't plant a sycamore by choice, but I enjoy 'my' random one that has sprung up. I pulled the ones that didn't suit. I just felled an 80 year old tree. It was the wrong tree for the wrong spot in many ways and wouldn't be a recommendation for 2025, but... again it was enjoyed and valued as a shade tree for many, many years. So if you like a tree, and it will bring you joy, go for it. Read about the pros, cons and care. In a snap, or one day you can retire a tree if it really is a problem. If you want an easy life, then pick something more manageable. Something like a Hazel - these can be grand when left, and rejuvenated if they get too wayward. Don't expect to tame a tree that wants to be huge, if you cut it back it will likely look ugly, and just want to grow back to its inherent height. If something doesn't work. Try something else. Just remember there's only X many years in life! And don't forget shrubs. If you care about wildlife, I have seen more going on in a thicket of shrubs than a small woodland. If you want a specimen tree to stand out, you'll need to give it room. Our long term plan is to whittle our garden trees down to about five. The ones that have the best shape so we can celebrate them. Currently we have about thirty. I've planted about 12, but it's taken me a decade to work out an overall scheme. Including losing a couple of old favourites or just coppicing them to enjoy the layers. Just web search each specimen, loads of good advice/guides out there.